{"id":18378,"date":"2025-12-15T09:02:17","date_gmt":"2025-12-15T14:02:17","guid":{"rendered":"https:\/\/blogs.mathworks.com\/simulink\/?p=18378"},"modified":"2025-12-16T13:36:27","modified_gmt":"2025-12-16T18:36:27","slug":"matlab-ai-coding-standards-for-simulating-simulink-models","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/simulink\/2025\/12\/15\/matlab-ai-coding-standards-for-simulating-simulink-models\/","title":{"rendered":"MATLAB AI Coding Standards for Simulating Simulink Models"},"content":{"rendered":"<div class=\"rtcContent\">\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\"><a href=\"https:\/\/matlab.mathworks.com\/open\/github\/v1?repo=simulink\/blog&amp;project=2025_12_12_SimulinkAICodingRules\/AI_SimulinkCodingRules.prj\"><img decoding=\"async\" loading=\"lazy\" class=\"imageNode\" style=\"vertical-align: baseline; width: 136px; height: 21px;\" src=\"https:\/\/blogs.mathworks.com\/simulink\/files\/SimulinkCodingRules.mlx-12-12-25_1.png\" alt=\"\" width=\"136\" height=\"21\" \/><\/a><\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">In my <a href=\"https:\/\/blogs.mathworks.com\/simulink\/2025\/12\/10\/simulating-a-simulink-model-through-github-copilot-and-the-matlab-mcp-server\/\">previous post<\/a>, I went through the basics of using <a href=\"https:\/\/github.com\/features\/copilot\" target=\"_blank\" rel=\"noopener\">GitHub Copilot<\/a> and the <a href=\"https:\/\/www.mathworks.com\/products\/matlab-mcp-core-server.html\">MATLAB MCP Server<\/a> to generate MATLAB code that can simulate a Simulink. While the AI-generated code simulated the model to completion, it had multiple issues, including:<\/div>\r\n<ul style=\"margin: 10px 0px 20px; padding-left: 0px; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-size: 14px;\">\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">Unnecessary logic for my application<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">Old syntax going against recommended modern best practices<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">Unexpected simulation results<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">Simply not the style I like<\/li>\r\n<\/ul>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">In this post, I will define coding instructions to guide the copilot such that it will generate the code I want at the first iteration.<\/div>\r\n<h2 style=\"margin: 20px 10px 5px 4px; padding: 0px; line-height: 25px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: bold; text-align: left;\">MATLAB AI Coding Rules<\/h2>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">Are you aware of this repository?<\/div>\r\n<ul style=\"margin: 10px 0px 20px; padding-left: 0px; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-size: 14px;\">\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\"><a href=\"http:\/\/github.com\/matlab\" target=\"_blank\" rel=\"noopener\">github.com\/matlab - MATLAB Development &amp; AI Coding Projects<\/a><\/li>\r\n<\/ul>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">It contains a set of <a href=\"https:\/\/github.com\/matlab\/rules\" target=\"_blank\" rel=\"noopener\">coding rules<\/a> optimized for use with AI coding assistants like Cursor, Windsurf, Claude Code, and GitHub Copilot.<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">Unfortunately, as of today, none of those rules apply specifically to Simulink models. It's time to change that!<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">Here is my first attempt at defining AI coding rules for MATLAB code simulating Simulink models.<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\"><span style=\"font-weight: bold; font-style: italic;\">Disclaimer:<\/span><span style=\"font-style: italic;\"> The rules defined in this post do not try to be general rules that all users should follow when simulating a Simulink model. Some are general best practices I encourage everybody to follow, for example using the Simulink.SimulationInput syntax. Others are specific to the code I like to see on this blog when simulating a model.<\/span><\/div>\r\n<h2 style=\"margin: 20px 10px 5px 4px; padding: 0px; line-height: 25px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: bold; text-align: left;\">Coding Rules to Simulate Simulink Models<\/h2>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">For this first attempt, I will focus on rules to generate MATLAB code I like to see on this blog to simulate Simulink models and plot results.<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">To begin, let's write down a few high-level requirements for the code I like to see:<\/div>\r\n<ul style=\"margin: 10px 0px 20px; padding-left: 0px; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-size: 14px;\">\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">Use the <a href=\"https:\/\/www.mathworks.com\/help\/simulink\/slref\/sim.html#d126e470370\"><span style=\"font-family: monospace;\">Simulink.SimulationInput<\/span> object syntax<\/a>.<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">Input signals to be passed through root-level Inport blocks should be stored as timeseries.<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">Signals are logged in a <span style=\"font-family: monospace;\">Simulink.SimulationData.Dataset<\/span> object and the individual signals stored as timeseries.<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">The code plotting simulation results should be as short and simple as possible.<\/li>\r\n<\/ul>\r\n<h2 style=\"margin: 20px 10px 5px 4px; padding: 0px; line-height: 25px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: bold; text-align: left;\">Using the Coding Rules<\/h2>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">As instructed in the <a href=\"https:\/\/github.com\/matlab\/rules?tab=readme-ov-file\" target=\"_blank\" rel=\"noopener\">MATLAB AI Coding rules readme.md<\/a>, I stored those rules in a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Markdown\" target=\"_blank\" rel=\"noopener\">markdown<\/a> file named <span style=\"font-family: monospace;\">.github\/copilot-instructions.md<\/span><\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\"><img decoding=\"async\" loading=\"lazy\" class=\"imageNode\" style=\"vertical-align: baseline; width: 395px; height: 222px;\" src=\"https:\/\/blogs.mathworks.com\/simulink\/files\/SimulinkCodingRules.mlx-12-12-25_2.png\" alt=\"\" width=\"395\" height=\"222\" \/><\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">By the way, did you know that the MATLAB Editor is now able to display markdown files?<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\"><img decoding=\"async\" loading=\"lazy\" class=\"imageNode\" style=\"vertical-align: baseline; width: 833px; height: 454px;\" src=\"https:\/\/blogs.mathworks.com\/simulink\/files\/SimulinkCodingRules.mlx-12-12-25_3.png\" alt=\"\" width=\"833\" height=\"454\" \/><\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">I typed my request in the GitHub Copilot chat, and it immediately created a first version of the script stepSim.m.<\/div>\r\n<div class=\"preformatted-plain\" style=\"margin: 10px 3px 10px 55px; padding: 10px 10px 10px 5px;\">\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">Create a MATLAB script named stepSim.m that simulates the Simulink model BasicModelingSimpleSystem.slx with a step input signal and plots the logged signal 'x'.<\/span><\/div>\r\n<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">The generated code is not exactly what I want, but it's closer than the first attempt in my previous post.<\/div>\r\n<div style=\"background-color: #f5f5f5; margin: 10px 15px 10px 0; display: inline-block; min-width: 100%;\">\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 1px solid #d9d9d9; border-bottom: 0px none #212121; border-radius: 4px 4px 0px 0px; padding: 6px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Model name<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">modelName = <span style=\"color: #a709f5;\">'BasicModelingSimpleSystem'<\/span>;<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Load the model<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">load_system(modelName);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Get the stop time from model<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">stopTime = str2double(get_param(modelName, <span style=\"color: #a709f5;\">'StopTime'<\/span>));<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Create time vector for step input signal<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">t = linspace(0, stopTime, 1000);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">F_data = ones(size(t));<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Create step input as timeseries<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">F = timeseries(F_data, t);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Create input dataset<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">simInput = Simulink.SimulationInput(modelName);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">simInput = simInput.setExternalInput(F);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Simulate the model<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">simOut = sim(simInput);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Extract logged signals and plot 'x'<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">x_signal = simOut.logsout.getElement(<span style=\"color: #a709f5;\">'x'<\/span>);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">figure(<span style=\"color: #a709f5;\">'Name'<\/span>, <span style=\"color: #a709f5;\">'Step Response'<\/span>, <span style=\"color: #a709f5;\">'NumberTitle'<\/span>, <span style=\"color: #a709f5;\">'off'<\/span>);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">plot(x_signal.Values.Time, x_signal.Values.Data, <span style=\"color: #a709f5;\">'LineWidth'<\/span>, 2);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">xlabel(<span style=\"color: #a709f5;\">'Time (s)'<\/span>);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">ylabel(<span style=\"color: #a709f5;\">'x'<\/span>);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">title(<span style=\"color: #a709f5;\">'Step Response of BasicModelingSimpleSystem'<\/span>);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 1px solid #d9d9d9; border-radius: 0px 0px 4px 4px; padding: 0px 45px 4px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">grid <span style=\"color: #a709f5;\">on<\/span>;<\/span><\/div>\r\n<\/div>\r\n<\/div>\r\n<div style=\"margin: 10px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">While this works, here are a few things I would like to tweak:<\/div>\r\n<ul style=\"margin: 10px 0px 20px; padding-left: 0px; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-size: 14px;\">\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">There is no need to use <span style=\"font-family: monospace;\">load_system<\/span> before simulating a model. The sim command will load the model if needed.<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">I prefer to use <span style=\"font-family: monospace;\">in<\/span> instead of <span style=\"font-family: monospace;\">simInput<\/span> for the <span style=\"font-family: monospace;\">Simulink.SimulationInput<\/span> object.<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">I prefer to use <span style=\"font-family: monospace;\">out<\/span> instead of <span style=\"font-family: monospace;\">simOut<\/span> for the <span style=\"font-family: monospace;\">Simulink.SimulationOutput<\/span> object.<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">When plotting simulation results, I prefer to use the <a href=\"https:\/\/www.mathworks.com\/help\/matlab\/ref\/timeseries.plot.html\"><span style=\"font-family: monospace;\">plot<\/span><\/a> method of MATLAB <span style=\"font-family: monospace;\">timeseries<\/span>, instead of extracting the time and data vectors.<\/li>\r\n<\/ul>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">Based on this result, I went through a series of iterations, adding more and more specific rules.<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">In the end, I came up with this set of rules: <a href=\"https:\/\/github.com\/simulink\/blog\/blob\/main\/2025_12_12_SimulinkAICodingRules\/.github\/copilot-instructions.md\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline;\">copilot-instructions.md<\/span><\/a><\/div>\r\n<div class=\"preformatted-plain\" style=\"margin: 10px 3px 10px 55px; padding: 10px 10px 10px 5px;\">\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">## Usage of the sim command to Simulate Simulink models<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">### General syntax<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Simulink models should always be simulated using the sim command<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- The sim command should be used with the syntax \"out = sim(in)\", where \"in\" is a Simulink.SimulationInput object and out is a Simulink.SimulationOutput object.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Use the variable name \"in\" for the Simulink.SimulationInput object.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Use the variable name \"out\" for the Simulink.SimulationOutput object.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Avoid using set_param for simulation. All parameters should be set through Simulink.SimulationInput methods.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Avoid using load_system or open_system for simulation. Models will be loaded automatically by the sim command.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Model parameters should be specified using the Simulink.SimulationInput method setModelParameter.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Block parameters should be specified using the Simulink.SimulationInput method setBlockParameter.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- New values for MATLAB variables used by the Simulink models should be specified using the Simulink.SimulationInput method setVariable.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">### Input signals<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Input signals should be passed to the model using Inport blocks.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- The values for the individual input signals should be stored in MATLAB timeseries. <\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- The timeseries should be combined into a Simulink.SimulationData.Dataset. For example: \"ds=Simulink.SimulationData.Dataset;ds{1} = myTimeseries;\"<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- The Simulink.SimulationData.Dataset should be specified using the Simulink.SimulationInput method setExternalInput. For example: \"in = in.setExternalInput(ds);\"<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">### Data logging<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Data is logged in dataset format.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Logged data can be accessed through the logsout field of the Simulink.SimulationOutput object, for example \"out.logsout\".<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Logged signals can be accessed by name using the get method, for example: \"out.logsout.get('signalName')\"<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Logged signals should be plotted using the timeseries plot command, for example: \"plot(out.logsout.get('signalName').Values)\"<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Avoid creating unnecessary variables when accessing logged data. Access logged data directly from the Simulink.SimulationOutput object. For example, use \"out.logsout.get('signalName').Values\" instead of creating a separate variable for the logged signal.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- Avoid unnecessary validation of the Simulink.SimulationOutput object. Assume the sim command returns a valid object. No try-catch or validation code is needed.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">- A Simulink.SimulationOutput does not have a isfield method. Do not use isfield to check for logged data.<\/span><\/div>\r\n<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">I repeated my original query. This time, the generated code is exactly what I was hoping for:<\/div>\r\n<div style=\"background-color: #f5f5f5; margin: 10px 15px 10px 0; display: inline-block; min-width: 100%;\">\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 1px solid #d9d9d9; border-bottom: 0px none #212121; border-radius: 4px 4px 0px 0px; padding: 6px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Simulation end time (seconds)<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">tEnd = 10;<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Create a step timeseries: 0 for t &lt; 1, 1 for t &gt;= 1<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">t = linspace(0, tEnd, 1001)';<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">u = double(t &gt;= 1);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">stepTS = timeseries(u, t);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Package into a dataset for external input<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">ds = Simulink.SimulationData.Dataset;<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">ds{1} = stepTS;<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Create SimulationInput using the model name (Simulink will load the model automatically)<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">in = Simulink.SimulationInput(<span style=\"color: #a709f5;\">'BasicModelingSimpleSystem'<\/span>);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">in = in.setModelParameter(<span style=\"color: #a709f5;\">'StopTime'<\/span>, num2str(tEnd));<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">in = in.setExternalInput(ds);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Run simulation<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">out = sim(in);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\"><span style=\"color: #008013;\">% Plot the logged signal 'x'<\/span><\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">plot(out.logsout.get(<span style=\"color: #a709f5;\">'x'<\/span>).Values);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">title(<span style=\"color: #a709f5;\">'Logged signal: x'<\/span>);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 0px none #212121; border-radius: 0px; padding: 0px 45px 0px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">xlabel(<span style=\"color: #a709f5;\">'Time (s)'<\/span>);<\/span><\/div>\r\n<\/div>\r\n<div class=\"inlineWrapper outputs\">\r\n<div style=\"border-left: 1px solid #d9d9d9; border-right: 1px solid #d9d9d9; border-top: 0px none #212121; border-bottom: 1px solid #d9d9d9; border-radius: 0px; padding: 0px 45px 4px 13px; line-height: 18.004px; min-height: 0px; white-space: nowrap; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace, Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px;\"><span style=\"white-space: pre;\">grid <span style=\"color: #a709f5;\">on<\/span>;<\/span><\/div>\r\n<div style=\"color: #212121; padding: 10px 0px 6px 17px; background: #ffffff none repeat scroll 0% 0% \/ auto padding-box border-box; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14px; overflow-x: hidden; line-height: 17.234px;\">\r\n<div class=\"inlineElement eoOutputWrapper disableDefaultGestureHandling embeddedOutputsFigure\" tabindex=\"-1\" data-testid=\"output_0\">\r\n<div class=\"outputLayer selectedOutputDecorationLayer doNotExport\" aria-hidden=\"true\"><\/div>\r\n<div class=\"outputLayer activeOutputDecorationLayer doNotExport\" aria-hidden=\"true\"><\/div>\r\n<div class=\"outputLayer scrollableOutputDecorationLayer doNotExport\" aria-hidden=\"true\"><\/div>\r\n<div class=\"outputLayer navigationFocusLayer doNotExport\" tabindex=\"-1\" role=\"application\" aria-hidden=\"false\"><\/div>\r\n<div class=\"figureElement eoOutputContent\" role=\"article\" aria-roledescription=\"Use Browse Mode to explore \" aria-description=\"figure output \"><img decoding=\"async\" class=\"figureImage figureContainingNode\" style=\"width: 560px;\" src=\"https:\/\/blogs.mathworks.com\/simulink\/files\/SimulinkCodingRules.mlx-12-12-25_4.png\" \/><\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<div style=\"margin: 10px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">Now that I have that working, let's keep exploring.<\/div>\r\n<h2 style=\"margin: 3px 10px 5px 4px; padding: 0px; line-height: 25px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: bold; text-align: left;\">MATLAB Test Class<\/h2>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">For my next experiment, I tried creating a <a href=\"https:\/\/www.mathworks.com\/help\/sltest\/ug\/test-models-using-matlab-based-simulink-tests.html\">MATLAB-Based Simulink Test<\/a>:<\/div>\r\n<div class=\"preformatted-plain\" style=\"margin: 10px 3px 10px 55px; padding: 10px 10px 10px 5px;\">\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">Simulate the Simulink model BasicModelingSimpleSystem.slx for a step input, capture the signal \"x\" and store it in a MAT-file to be used for baseline validation.<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">Create a MATLAB Test class that simulates the Simulink model BasicModelingSimpleSystem.slx do baseline validation using the saved MAT-file.<\/span><\/div>\r\n<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">I was pretty happy with the results. It created 3 files:<\/div>\r\n<ul style=\"margin: 10px 0px 20px; padding-left: 0px; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-size: 14px;\">\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">A script to generate and save the baseline<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">A MAT-file containing the baseline results<\/li>\r\n \t<li style=\"margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap;\">The requested MATLAB Test class<\/li>\r\n<\/ul>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\"><img decoding=\"async\" loading=\"lazy\" class=\"imageNode\" style=\"vertical-align: baseline; width: 550px; height: 474px;\" src=\"https:\/\/blogs.mathworks.com\/simulink\/files\/SimulinkCodingRules.mlx-12-12-25_5.png\" alt=\"\" width=\"550\" height=\"474\" \/><\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">Here is what the MATLAB Test class looks like. It's simple and follows my coding rules.<\/div>\r\n<div class=\"preformatted-matlab\" style=\"margin: 10px 3px 10px 55px; padding: 10px 10px 10px 5px;\">\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\"><span style=\"color: #0e00ff;\">classdef <\/span>TestBasicModelingSimpleSystem &lt; matlab.unittest.TestCase<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0<span style=\"color: #008013;\">% Test class for baseline validation of BasicModelingSimpleSystem.slx<\/span><\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0<span style=\"color: #0e00ff;\">methods <\/span>(Test)<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color: #0e00ff;\">function <\/span>testBaselineX(testCase)<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color: #008013;\">% Simulation end time<\/span><\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tEnd = 10;<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0t = linspace(0, tEnd, 1001)';<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0u = double(t &gt;= 1);<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0stepTS = timeseries(u, t);<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ds = Simulink.SimulationData.Dataset;<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ds{1} = stepTS;<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0in = Simulink.SimulationInput(<span style=\"color: #a709f5;\">'BasicModelingSimpleSystem'<\/span>);<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0in = in.setModelParameter(<span style=\"color: #a709f5;\">'StopTime'<\/span>, num2str(tEnd));<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0in = in.setExternalInput(ds);<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0out = sim(in);<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0x_actual = out.logsout.get(<span style=\"color: #a709f5;\">'x'<\/span>).Values;<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color: #008013;\">% Load baseline<\/span><\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0baseline = load(<span style=\"color: #a709f5;\">'x_baseline.mat'<\/span>, <span style=\"color: #a709f5;\">'x_baseline'<\/span>);<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0x_baseline = baseline.x_baseline;<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color: #008013;\">% Compare signals (allowing for small numerical differences)<\/span><\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0testCase.verifyEqual(x_actual.Data, x_baseline.Data, <span style=\"color: #a709f5;\">'AbsTol'<\/span>, 1e-8);<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0testCase.verifyEqual(x_actual.Time, x_baseline.Time, <span style=\"color: #a709f5;\">'AbsTol'<\/span>, 1e-8);<\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color: #0e00ff;\">end<\/span><\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\">\u00a0\u00a0\u00a0\u00a0<span style=\"color: #0e00ff;\">end<\/span><\/span><\/div>\r\n<div style=\"border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: #212121; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border: 0px none #212121;\"><span style=\"white-space: pre;\"><span style=\"color: #0e00ff;\">end<\/span><\/span><\/div>\r\n<\/div>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">I could add more rules to refine this test class, but I think this will be enough for today.<\/div>\r\n<h2 style=\"margin: 20px 10px 5px 4px; padding: 0px; line-height: 25px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: bold; text-align: left;\">Now it's your turn<\/h2>\r\n<div style=\"margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: #212121; font-family: Helvetica, Arial, sans-serif, Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left;\">What kind of Simulink AI Coding Rules would you like to see? Which AI coding assistant is your favorite? Let us know in the comments below.<\/div>\r\n&nbsp;\r\n\r\n<\/div>\r\n<script type=\"text\/javascript\">\r\n{ let css = '.eoOutputWrapper { width: calc(90vw - 10px) !important; }';\r\nlet head = document.head || document.getElementsByTagName('head')[0];\r\nlet style = document.createElement('style');\r\nhead.appendChild(style);\r\nstyle.type = 'text\/css';\r\nif (style.styleSheet) {\r\n    style.styleSheet.cssText = css;\r\n} else {\r\n    style.appendChild(document.createTextNode(css));\r\n}\r\n\r\n\r\n}<\/script>","protected":false},"excerpt":{"rendered":"<div class=\"overview-image\"><img src=\"https:\/\/blogs.mathworks.com\/simulink\/files\/ML_SL_Copilot.png\" class=\"img-responsive attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/><\/div><p>\r\n\r\nIn my previous post, I went through the basics of using GitHub Copilot and the MATLAB MCP Server to generate MATLAB code that can simulate a Simulink. While the AI-generated code simulated the... <a class=\"read-more\" href=\"https:\/\/blogs.mathworks.com\/simulink\/2025\/12\/15\/matlab-ai-coding-standards-for-simulating-simulink-models\/\">read more >><\/a><\/p>","protected":false},"author":41,"featured_media":18379,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[700,16],"tags":[701],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/18378"}],"collection":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/users\/41"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/comments?post=18378"}],"version-history":[{"count":5,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/18378\/revisions"}],"predecessor-version":[{"id":18391,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/18378\/revisions\/18391"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/media\/18379"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/media?parent=18378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/categories?post=18378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/tags?post=18378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}