Using global variable to define a Simulink block parameter

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zohaib
zohaib 2011-11-23
Hi, i guess it should have been simple but i cant find a solution since long time. I have a simulink model that has a "Matlab function" block. I have a parameters' function that i load each time automatically using simulink Callbacks=> InitFcn. I want my Matlab functin block to take its Sample time parameter defined in this init function, but it does not work.
but when i define the parameter manually in the matlab workspace, the block takes it.
any ideas !!
thanks in advance,
aft kh

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2011-11-23
In the InitFcn call, does it call a M-function or M-script? I suspect this is another case of function workspace and base workspace.
Clear the base workspace using "clear", then run whatever is in the InitFcn. Then check the base worksapce, do you see the sample time parameter?
As you indicated, you need to set the sample time parameter in the MATLAB base workspace.

更多回答（2 个）

Kaustubha Govind
Kaustubha Govind 2011-11-23
When you update your model, is that parameter created in the base workspace? Make sure that you the place where you define the parameters is a script and not a function (in which case, the variables are created in the function workspace and deleted as soon as the function returns).
If you do see the parameter created in the base workspace, then this should work. What is the error that you see?
zohaib
zohaib 2011-11-23
thanks both of you. in fact, my InitFcn file was a function, and not a simple script. Got it.
thanks again.

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