How to initialize variables (parameters) in Simulink

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Kiran Sagar
Kiran Sagar on 16 Jul 2013
Commented: Ting Liang on 1 Dec 2020
I have a model of a mechanical system in simulink, which has a lot of parameters which are NOT variables mathematically speaking. eg. Mass, length of a body.
i have some fixed values for these parameters which do not change during the simulation. my model is having many user-defined blocks and in each block i have to initialize the same variables.
is there any method by which i can initialize variables in common for all user-defined blocks. OR may be i could initialize these variables in a file and extract it.
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Kiran Sagar
Kiran Sagar on 16 Jul 2013
the primary aim is to have a single source of the parameter values, so that i need not go to each block to change the value of single parameter

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Answers (1)

Kaustubha Govind
Kaustubha Govind on 16 Jul 2013
Yes, typically this kind of initialization is done using MATLAB code that is called from the model InitFcn callback, so that the code is run every time the model is compiled or run. If you want the parameters to be created only once when the model is open, you can use the PostLoadFcn callback.
  1 Comment
Ting Liang
Ting Liang on 1 Dec 2020
Hi, Kaustubha,
Excuse me.
Can I ask whether it is possible to set up a M file(M code) to achieve parameter initialization? Cause if I use InitFcn to initialize the parameters, they cannot be annotated, some time later, it would be difficult for me to recognize these parameters?
Best regards

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