Variant control variable initialization

I have a variant subsystem where one of the controls is throttle_controller == 1.

My initFcn first clears the workspace, then runs a script where this variable throttle_controller gets initialized. If I run the stuff in the initFcn from the command line, this variable throttle_controller does show up so I know the initFcn works as intended.

When I run the simulation, I get an error

Variant control 'throttle_controller == 1' used by block 'Car/software/throttle_controller' should return a logical value.

Caused by:

• Undefined function or variable 'throttle_controller'.

Then I check the workspace, it is blank. Apparently the initFcn didn't even run yet. Does the variant subsystem look for its necessary variables before callbacks are run?

How do I initialize the variable in the initFcn? I don't want to put it in postLoadFcn because I change the value of the variable and run the model many times after I load it once.

Answer 1

[Jesús Zambrano]

Hi Cheyenne,

Try to use the PreLoadFcn callback, which is executed before the model is loaded. The variable will be in the workspace, then you can change it before running a new variant. Also check some workflow here https://se.mathworks.com/help/simulink/ug/create-and-open-models.html#btozflu-1