Dialog box in the mask for different equations

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Igor
Igor 2023-4-25
编辑： Fangjun Jiang 2023-5-2
Hi, I want to create a block that can do simple calculation, e.g. u^2, sqrt(u), etc, by selecting the function from the drop down menu
e.g.,
  • if selection equal to a, do u^2
  • selection is equal to b, do u + 3
  • selection equal to c , do sqrt(u)
switch select
case 'a'
gain = u^2;
case 'b'
gain = u + 3;
case 'c'
gain = sqrt(u);
end
I have added the code to the mask Initialization. When I run the model, I get the error:
Undefined function or variable 'gain'.
Inside the mask is a Fcn block with the parameter gain.
Example code is in the attachment.

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2023-4-27
编辑：Fangjun Jiang 2023-4-27
A few steps.
  1. Change the name of the "Interpreted MATLAB Function" block to be "MyFun", so it's easy to reference it in the code.
  2. Change the Initialization code to be below. The name of the function cannot be passed like in your original code.
  3. Uncheck the "Evaluate" checkbox for the parameter "select". The value of the parameter "select" will be returned as 'a', or 'b' or 'c'. Otherwise, it will try to "Evaluate" the variable 'a', or 'b', or 'c' and then return the evaluated value to the parameter "select".
switch select
case 'a'
set_param([gcb,'/MyFun'],'MATLABFcn','u^2');
case 'b'
set_param([gcb,'/MyFun'],'MATLABFcn','u+3');
case 'c'
set_param([gcb,'/MyFun'],'MATLABFcn','sqrt(u)');
end
  2 个评论
Igor
Igor 2023-5-2
Thank you for the answer
Do you maybe know how to create a library block from this? When I do it, the selection gets hard-coded, and I cannot apply different option without breaking the link.

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