How do I export internal variables from a Simscape file to the MATLAB Workspace, in Simscape ?

I have a Simscape file that uses some internal variables that are not exposed as block outputs. I would like to be able to output these variables to the MATLAB Workspace for inspection.

I realize that I could convert these variables to block outputs to gain access to them, but I would prefer to avoid this approach if possible.

Answer 1

[MathWorks Support Team]

There are two ways to log Simscape data:

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Option 1: Simscape data logging (R2010a+)

It is possible to use the 'Log simulation data' option in the Configuration Parameters to log data from internal variables to the workspace:

https://www.mathworks.com/help/simscape/ug/about-simscape-data-logging.html

To explore this feature, you can create a model using the “Spring” Simscape file example:

https://www.mathworks.com/help/simscape/lang/mechanical-component-spring.html

In the “Spring” example, an internal variable named “theta” is used. If you turn on data logging as shown at the following link, the workspace variable will contain "theta". The results can be viewed in "Simscape Results Explorer" (R2014b+):

https://www.mathworks.com/help/simscape/ug/log-navigate-and-plot-simulation-data.html

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Option 2: Selective Logging (R2024a+)

Starting in R2024a, you can log individual Simscape block variables, including from custom components, to the workspace and view them in the "Simulation Data Inspector":

https://www.mathworks.com/help/simscape/ug/about-selective-logging-instrumentation.html

To explore this feature, see the following example:

https://www.mathworks.com/help/simscape/ug/log-individual-block-variables.html

You can also manage selective logging instrumentation programmatically. To learn more, see::

https://www.mathworks.com/help/releases/R2024a/simscape/ug/manage-selective-logging-instrumentation-programmatically.html