{"id":12230,"date":"2022-05-05T16:49:01","date_gmt":"2022-05-05T20:49:01","guid":{"rendered":"https:\/\/blogs.mathworks.com\/simulink\/?p=12230"},"modified":"2022-06-14T09:44:18","modified_gmt":"2022-06-14T13:44:18","slug":"unifying-matlab-and-simulink-a-user-story-part-3","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/simulink\/2022\/05\/05\/unifying-matlab-and-simulink-a-user-story-part-3\/","title":{"rendered":"Unifying MATLAB and Simulink: A User Story Part 3"},"content":{"rendered":"<div class = rtcContent><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>In today's post, I will add features to the framework presented in the previous post to help controlling variants. <\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>If you missed the previous posts in this series, here are links to all posts:<\/span><\/div><ul  style = 'margin: 10px 0px 20px; padding-left: 0px; font-family: Helvetica, Arial, sans-serif; font-size: 14px; '><li  style = 'margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap; '><a href = \"https:\/\/blogs.mathworks.com\/simulink\/2022\/04\/22\/unifying-matlab-and-simulink-a-user-story-part-1\/\"><span>Unifying MATLAB and Simulink: A User Story Part 1<\/span><\/a><span>: Parameterizing a model with MATLAB objects<\/span><\/li><li  style = 'margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap; '><a href = \"https:\/\/blogs.mathworks.com\/simulink\/2022\/04\/28\/unifying-matlab-and-simulink-a-user-story-part-2\/\"><span>Unifying MATLAB and Simulink: A User Story Part 2<\/span><\/a><span>: The <\/span><span style=' font-family: monospace;'>slPart<\/span><span> class, block template and data variants<\/span><\/li><li  style = 'margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap; '><a href = \"https:\/\/blogs.mathworks.com\/simulink\/2022\/05\/05\/unifying-matlab-and-simulink-a-user-story-part-3\/\"><span>Unifying MATLAB and Simulink: A User Story Part 3<\/span><\/a><span>: Controlling variants with MATLAB objects<\/span><\/li><li  style = 'margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap; '><a href = \"https:\/\/blogs.mathworks.com\/simulink\/2022\/05\/13\/unifying-matlab-and-simulink-a-user-story-part-4\/\"><span>Unifying MATLAB and Simulink: A User Story Part 4<\/span><\/a><span>: Post-processing and visualizing logged data<\/span><\/li><li  style = 'margin-left: 56px; line-height: 21px; min-height: 0px; text-align: left; white-space: pre-wrap; '><a href = \"https:\/\/blogs.mathworks.com\/simulink\/?p=12404\"><span>Unifying MATLAB and Simulink: A User Story Part 5<\/span><\/a><span>: Larger examples<\/span><\/li><\/ul><h2  style = 'margin: 20px 10px 5px 4px; padding: 0px; line-height: 20px; min-height: 0px; white-space: pre-wrap; color: rgb(33, 33, 33); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: 700; text-align: left; '><span>Variant slPart Block<\/span><\/h2><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>To handle variants, I added a second template block to the library where I had previously stored the <\/span><span style=' font-family: monospace;'>slPart<\/span><span> template block. This second template is a <\/span><a href = \"https:\/\/www.mathworks.com\/help\/releases\/R2022a\/simulink\/slref\/variantsubsystemvariantmodel.html\"><span>Variant Subsystem<\/span><\/a><span> with the same mask and same mask initialization callback as described in my <\/span><a href = \"https:\/\/blogs.mathworks.com\/simulink\/2022\/04\/28\/unifying-matlab-and-simulink-a-user-story-part-2\/\"><span>previous post<\/span><\/a><span>:<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><img class = \"imageNode\" src = \"https:\/\/blogs.mathworks.com\/simulink\/files\/maskingEvolutionPart3_1.png\" width = \"382\" height = \"172\" alt = \"\" style = \"vertical-align: baseline; width: 382px; height: 172px;\"><\/img><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>In the block dialog, I set the <\/span><a href = \"https:\/\/www.mathworks.com\/help\/releases\/R2022a\/simulink\/ug\/variant-control-modes-in-variant-blocks.html\"><span>Variant Control Mode<\/span><\/a><span> to <\/span><span style=' font-weight: bold;'>Label<\/span><span>.<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><img class = \"imageNode\" src = \"https:\/\/blogs.mathworks.com\/simulink\/files\/maskingEvolutionPart3_2.png\" width = \"469\" height = \"255\" alt = \"\" style = \"vertical-align: baseline; width: 469px; height: 255px;\"><\/img><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>Using <\/span><a href = \"https:\/\/www.mathworks.com\/help\/releases\/R2022a\/simulink\/ug\/variant-control-modes-in-variant-blocks.html#mw_d07c2f29-fd8d-488c-8434-71e830b00199\"><span>label mode<\/span><\/a><span> will allow us in the next step to change the active variant based on the class of the <\/span><span style=' font-family: monospace;'>slPart<\/span><span> object specified in the mask parameter.<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>When I will copy this block to models, I will be able to add to it as many algorithm variants as I want.<\/span><\/div><h2  style = 'margin: 20px 10px 5px 4px; padding: 0px; line-height: 20px; min-height: 0px; white-space: pre-wrap; color: rgb(33, 33, 33); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: 700; text-align: left; '><span>Adding Variant Specification to slPart<\/span><\/h2><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>The goal here is to select the active variant based on the class of the object, which is specified as a mask parameter. For that, I add the following code to the <\/span><span style=' font-family: monospace;'>maskInit<\/span><span> method of <\/span><span style=' font-family: monospace;'>slPart<\/span><span>:<\/span><\/div><div class = 'preformatted-matlab' style = 'margin: 10px 3px 10px 55px; padding: 10px 10px 10px 5px; '><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span style=\"color: rgb(0, 0, 255);\">classdef <\/span><span >slPart &lt; handle<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >    <\/span><span style=\"color: rgb(0, 0, 255);\">properties <\/span><span >(Hidden = true)<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        BlockPath <\/span><span style=\"color: rgb(160, 82, 45);\">char<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >    <\/span><span style=\"color: rgb(0, 0, 255);\">end<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >    <\/span><span style=\"color: rgb(0, 0, 255);\">methods<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        <\/span><span style=\"color: rgb(0, 0, 255);\">function <\/span><span >obj = maskInit(obj,blk)<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >            obj.BlockPath = blk;<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >            <\/span><span style=\"color: rgb(34, 139, 34);\">% If the block has variants, set active variant based on the object class<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >            <\/span><span style=\"color: rgb(0, 0, 255);\">if <\/span><span >strcmp(get_param(blk,<\/span><span style=\"color: rgb(160, 32, 240);\">'Variant'<\/span><span >),<\/span><span style=\"color: rgb(160, 32, 240);\">'on'<\/span><span >)<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >                variantChoices = get_param(blk,<\/span><span style=\"color: rgb(160, 32, 240);\">'VariantChoices'<\/span><span >);  <\/span><span style=\"color: rgb(34, 139, 34);\">% Get all variant choices<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >                variantChoices = {variantChoices.Name}';           <\/span><span style=\"color: rgb(34, 139, 34);\">% Extract the labels<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >                classList = [class(obj);superclasses(obj)];        <\/span><span style=\"color: rgb(34, 139, 34);\">% Get the list of class and superclasses<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >                matchingChoices = intersect(classList,variantChoices); <\/span><span style=\"color: rgb(34, 139, 34);\">% Find the label that matches the class or closest superclass<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >                set_param(blk,<\/span><span style=\"color: rgb(160, 32, 240);\">'LabelModeActiveChoice'<\/span><span >,matchingChoices{1}); <\/span><span style=\"color: rgb(34, 139, 34);\">% Apply the first match<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >            <\/span><span style=\"color: rgb(0, 0, 255);\">end<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        <\/span><span style=\"color: rgb(0, 0, 255);\">end<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >    <\/span><span style=\"color: rgb(0, 0, 255);\">end<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span style=\"color: rgb(0, 0, 255);\">end<\/span><\/span><\/div><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>This code will compare the variant control labels of each variant and find the one that matches the class of the object or its closest superclass. At the end, it uses <\/span><a href = \"https:\/\/www.mathworks.com\/help\/releases\/R2022a\/simulink\/slref\/set_param.html\"><span>set_param<\/span><\/a><span> to activate the chosen variant based on its label (More on that below). <\/span><\/div><h2  style = 'margin: 20px 10px 5px 4px; padding: 0px; line-height: 20px; min-height: 0px; white-space: pre-wrap; color: rgb(33, 33, 33); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: 700; text-align: left; '><span>Implementing a Variant <\/span><span style=' font-family: monospace;'>slPart<\/span><\/h2><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>Let's keep building on the spring example from the previous post. I add my template block to a model and create two variants, one is the same linear spring as in the previous example, and the other is a non-linear version:<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><img class = \"imageNode\" src = \"https:\/\/blogs.mathworks.com\/simulink\/files\/maskingEvolutionPart3_3.png\" width = \"864\" height = \"575\" alt = \"\" style = \"vertical-align: baseline; width: 864px; height: 575px;\"><\/img><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>I create a new <\/span><span style=' font-family: monospace;'>slPart<\/span><span> class for the non-linear version and save it in the <\/span><span style=' font-family: monospace;'>+springLib<\/span><span> package created in the previous post. From now on, I will refer to this class as <\/span><span style=' font-family: monospace;'>springLib.springNonLinear:<\/span><\/div><div class = 'preformatted-matlab' style = 'margin: 10px 3px 10px 55px; padding: 10px 10px 10px 5px; '><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span style=\"color: rgb(0, 0, 255);\">classdef <\/span><span >springNonLinear &lt; slPart<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >    <\/span><span style=\"color: rgb(0, 0, 255);\">properties<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        m<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        displacementBreakPoints;<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        stiffnessTable;<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        velocityBreakPoints;<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        dampingTable;<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >    <\/span><span style=\"color: rgb(0, 0, 255);\">end<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >    <\/span><span style=\"color: rgb(0, 0, 255);\">methods<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        <\/span><span style=\"color: rgb(0, 0, 255);\">function <\/span><span >obj = springNonLinear()<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >            obj.m = 1;<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >            obj.displacementBreakPoints = -5:5;<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >            obj.stiffnessTable = tanh(-5:5);<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >            obj.velocityBreakPoints = -5:5;<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >            obj.dampingTable = 2*tanh(-5:5);<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >        <\/span><span style=\"color: rgb(0, 0, 255);\">end<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span >    <\/span><span style=\"color: rgb(0, 0, 255);\">end<\/span><\/span><\/div><div  style = 'border-left: 0px none rgb(0, 0, 0); border-right: 0px none rgb(0, 0, 0); border-top: 0px none rgb(0, 0, 0); border-bottom: 0px none rgb(0, 0, 0); border-radius: 0px; padding: 0px; line-height: 15.6px; min-height: 16px; white-space: pre; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, \"Courier New\", monospace; font-size: 12px; '><span style=\"white-space: pre\"><span style=\"color: rgb(0, 0, 255);\">end<\/span><\/span><\/div><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>Now, the key thing for the mask initialization method to be able to set the proper variant is to <\/span><span style=' font-weight: bold;'>set the label of each variant to the name of corresponding class<\/span><span>. <\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><img class = \"imageNode\" src = \"https:\/\/blogs.mathworks.com\/simulink\/files\/maskingEvolutionPart3_4.png\" width = \"874\" height = \"189\" alt = \"\" style = \"vertical-align: baseline; width: 874px; height: 189px;\"><\/img><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>One thing I want to point out here is that it would be possible to obtain a similar variant activation logic using <\/span><a href = \"https:\/\/www.mathworks.com\/help\/releases\/R2022a\/simulink\/ug\/variant-control-modes-in-variant-blocks.html#mw_03ed4de2-547c-43b0-b7e2-320658e4e2d1\"><span>expression mode<\/span><\/a><span> instead of <\/span><a href = \"https:\/\/www.mathworks.com\/help\/releases\/R2022a\/simulink\/ug\/variant-control-modes-in-variant-blocks.html#mw_d07c2f29-fd8d-488c-8434-71e830b00199\"><span>label mode<\/span><\/a><span>. The main difference in my opinion is that, by using label mode controlled by the mask initialization method defined in the <\/span><span style=' font-family: monospace;'>slPart<\/span><span> superclass, the complexity is managed in a single place: in the <\/span><span style=' font-family: monospace;'>slPart<\/span><span> superclass. While expression mode offers more possibilities, for example different <\/span><a href = \"https:\/\/www.mathworks.com\/help\/releases\/R2022a\/simulink\/ug\/activate-variant-during-different-stages-of-simulation-and-code-generation-workflow.html\"><span>activation times<\/span><\/a><span>, it puts the complexity on writing down the condition expression on each user adding a new variant.<\/span><\/div><h2  style = 'margin: 20px 10px 5px 4px; padding: 0px; line-height: 20px; min-height: 0px; white-space: pre-wrap; color: rgb(33, 33, 33); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: 700; text-align: left; '><span>More Variant Parameterizations<\/span><\/h2><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>Once the Variant Subsystem has been configured, as described in <\/span><a href = \"https:\/\/blogs.mathworks.com\/simulink\/2022\/04\/28\/unifying-matlab-and-simulink-a-user-story-part-2\/\"><span>post 2 of this series<\/span><\/a><span>, I can optionally create variant parameterizations for the newly created non-linear spring:<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><img class = \"imageNode\" src = \"https:\/\/blogs.mathworks.com\/simulink\/files\/maskingEvolutionPart3_5.png\" width = \"993\" height = \"295\" alt = \"\" style = \"vertical-align: baseline; width: 993px; height: 295px;\"><\/img><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>With those saved in the <\/span><span style=' font-family: monospace;'>+springLib<\/span><span> package folder, I now have doubled the size of my library of springs, which I can still access through tab-completion:<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><img class = \"imageNode\" src = \"https:\/\/blogs.mathworks.com\/simulink\/files\/maskingEvolutionPart3_6.png\" width = \"356\" height = \"190\" alt = \"\" style = \"vertical-align: baseline; width: 356px; height: 190px;\"><\/img><\/div><h2  style = 'margin: 20px 10px 5px 4px; padding: 0px; line-height: 20px; min-height: 0px; white-space: pre-wrap; color: rgb(33, 33, 33); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: 700; text-align: left; '><span>Selecting a Part and Simulating the Corresponding Variant<\/span><\/h2><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>Once the model is properly configured and the MATLAB classes have been created, I can assign an object of the desired type to the variable specified in the block mask dialog and Simulink will automatically use the appropriate variant subsystem during simulation.<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><img class = \"imageNode\" src = \"https:\/\/blogs.mathworks.com\/simulink\/files\/maskingEvolutionPart3_7.gif\" width = \"928\" height = \"432\" alt = \"slPart_Post3.gif\" style = \"vertical-align: baseline; width: 928px; height: 432px;\"><\/img><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>I like the fact that, if I give this model to someone, all that person needs to do is to pick a spring from the <\/span><span style=' font-family: monospace;'>springLib <\/span><span>package. No need to know or care about the fact that it might be activating a different variant subsystem under the hood.<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>That way, you inherit a component where the inner mechanics have been abstracted so you can focus on using it and not be distracted by implementation details.<\/span><\/div><h2  style = 'margin: 20px 10px 5px 4px; padding: 0px; line-height: 20px; min-height: 0px; white-space: pre-wrap; color: rgb(33, 33, 33); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 20px; font-weight: 700; text-align: left; '><span>Now it's your turn<\/span><\/h2><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>Obviously, what I showed here is the bare minimum to get this technique working. For a realistic project, I would add validation code and error checking to better guide the user in case something goes wrong. <\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>If you want to analyze this project in more detail, you can download the current version <\/span><a href = \"https:\/\/blogs.mathworks.com\/images\/simulink\/2022Q2\/Unifying_ML_SL_Part3.mlproj\"><span>here<\/span><\/a><span>.<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>What do you think of this approach to variants? Did you or your company came up with other ways to systematically control variants? I would be interested to hear how the usability compares with what I described in this post.<\/span><\/div><div  style = 'margin: 2px 10px 9px 4px; padding: 0px; line-height: 21px; min-height: 0px; white-space: pre-wrap; color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-style: normal; font-size: 14px; font-weight: 400; text-align: left; '><span>Let us know in the comments below.<\/span><\/div>\r\n<\/div><script type=\"text\/javascript\">var css = ''; var head = document.head || document.getElementsByTagName('head')[0], style = document.createElement('style'); head.appendChild(style); style.type = 'text\/css'; if (style.styleSheet){ style.styleSheet.cssText = css; } else { style.appendChild(document.createTextNode(css)); }<\/script><a href=\"https:\/\/blogs.mathworks.com\/simulink\/files\/maskingEvolutionPart3.mlx\"><button class=\"btn btn-sm btn_color_blue pull-right add_margin_10\">Download Live Script<\/button><\/a>","protected":false},"excerpt":{"rendered":"<div class=\"overview-image\"><img src=\"https:\/\/blogs.mathworks.com\/simulink\/files\/maskingEvolutionPart3_7.gif\" class=\"img-responsive attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/><\/div><p>In today's post, I will add features to the framework presented in the previous post to help controlling variants. If you missed the previous posts in this series, here are links to all... <a class=\"read-more\" href=\"https:\/\/blogs.mathworks.com\/simulink\/2022\/05\/05\/unifying-matlab-and-simulink-a-user-story-part-3\/\">read more >><\/a><\/p>","protected":false},"author":41,"featured_media":12602,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[34,47,30,69],"tags":[638],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/12230"}],"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=12230"}],"version-history":[{"count":3,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/12230\/revisions"}],"predecessor-version":[{"id":12608,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/12230\/revisions\/12608"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/media\/12602"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/media?parent=12230"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/categories?post=12230"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/tags?post=12230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}