{"id":2169,"date":"2013-05-03T10:34:33","date_gmt":"2013-05-03T15:34:33","guid":{"rendered":"https:\/\/blogs.mathworks.com\/seth\/?p=2169"},"modified":"2017-05-02T18:57:58","modified_gmt":"2017-05-02T23:57:58","slug":"comparing-runs-using-simulink-data-inspector","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/simulink\/2013\/05\/03\/comparing-runs-using-simulink-data-inspector\/","title":{"rendered":"Comparing Runs using Simulation Data Inspector"},"content":{"rendered":"

Do you use the Simulation Data Inspector<\/a>? Here is an example where it saved me a lot of debugging time.<\/p>\r\n\r\n

Simulation Accuracy<\/strong><\/p>\r\n\r\n

I recently had to validate system behavior and analyze numerical accuracy of a model. Making small modifications in one part of the model was leading to unexpectedly large differences at the outputs. Since the model was very large, I thought it would be painful to insert Scopes<\/a> or To Workspace<\/a> blocks in the model to try identifying the source of the problem.<\/p>\r\n\r\n

I found out that the Simulation Data Inspector can be very useful to compare simulation results<\/a> without adding blocks to your model and without writing any scripts. Let's see how this work!<\/p>\r\n\r\n

Logging Signals<\/strong><\/p>\r\n\r\n

The first step is to configure signals for logging<\/a>. I like to use the Model Explorer<\/a> for that. It is significantly faster than right-clicking on the signal lines one by one. Here are a few tips to configure the Model Explorer with the goal of controlling signal logging.<\/p>\r\n\r\n

\"Configuring<\/p>\r\n\r\n

Also, ensure that signal logging is enabled in the model configuration.<\/p>\r\n\r\n

\"Enabling<\/p>\r\n\r\n

Record & Inspect Simulation Output<\/strong><\/p>\r\n\r\n

In your model, click on the Record button.<\/p>\r\n\r\n

\"Record<\/p>\r\n\r\n

When the simulation is completed, open the Simulation Data Inspector using the link that pops up.<\/p>\r\n\r\n

\"Launching<\/p>\r\n\r\n

Compare Runs<\/strong><\/p>\r\n\r\n

Make some changes to your model and simulate it again. In the Simulation Data Inspector, go to the Compare Runs<\/strong> Tab, select your 2 runs and click Compare<\/strong>.<\/p>\r\n\r\n

Using the absolute tolerance I specified, the Simulation data Inspector helped me to quickly identify where the divergence appear in my model.<\/p>\r\n\r\n

\"Comparing<\/p>\r\n\r\n\r\n\r\n

Now it's your turn<\/strong><\/p>\r\n\r\n

Give a look and the Validate System Behavior section of the documentation to learn more about the Simulation Data Inspector and let us know if it helps your workflow by leaving a comment here<\/a>.\r\n\r\n\r\n\r\n\r\n\r\n\r\n","protected":false},"excerpt":{"rendered":"

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Do you use the Simulation Data Inspector? Here is an example where it saved me a lot of debugging time.\r\n\r\nSimulation Accuracy\r\n\r\nI recently had to validate system behavior and analyze numerical... read more >><\/a><\/p>","protected":false},"author":41,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[121,43,24,11,33],"tags":[322,321,320],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/2169"}],"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=2169"}],"version-history":[{"count":29,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/2169\/revisions"}],"predecessor-version":[{"id":6529,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/2169\/revisions\/6529"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/media?parent=2169"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/categories?post=2169"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/tags?post=2169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}