# Dialog box in the mask for different equations

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Igor el 25 de Abr. de 2023
Editada: Fangjun Jiang el 2 de Mayo de 2023
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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Fangjun Jiang el 27 de Abr. de 2023
Editada: Fangjun Jiang el 27 de Abr. de 2023
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
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Fangjun Jiang el 2 de Mayo de 2023
Editada: Fangjun Jiang el 2 de Mayo de 2023
check the option "allow library blocks to modify its contents"

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