How can I set a variable in my workspace as a constant?

Question

Tom Baker 2015-11-17

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https://ww2.mathworks.cn/matlabcentral/answers/255418-how-can-i-set-a-variable-in-my-workspace-as-a-constant

评论： Walter Roberson 2015-11-19

Hello everyone,

I'm building a model in Simulink and the size of a few of my state flows depend on a variable in my workspace. I set this variable once in my initialisation, before running the Simulink model. The variable won't change for the duration of the simulation, it's a constant. If I now try and integrate my state flow with a discrete time integrator, I get the error: The discrete time integration with variable state flows is not supported. To work around this problem I have tried to set the variable from my workspace to not "tunable" in my simulink model, which sadly does not have any effect.

Is there a way to let Matlab/Simulink know that the variable that I've set once at the beginning will not change for the duration of the simulation?

Thank you in advance! Tom