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

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Tom Baker
Tom Baker 2015-11-17
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

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回答（1 个）

Satyajeet Sasmal
Satyajeet Sasmal 2015-11-19
The link below shows you how to set a constant property so that it can be used later. And these values cannot be changed once set:
http://www.mathworks.com/help/matlab/matlab_oop/properties-with-constant-values.html
I hope this was helpful.
-Satya
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Walter Roberson
Walter Roberson 2015-11-19
But can these be used that way in Simulink? Simulink has its own peculiar ideas about what is constant or not.

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