Output sizes for MATALB function block in Simulink.

Question

gdz 2023-1-30

0
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https://ww2.mathworks.cn/matlabcentral/answers/1902935-output-sizes-for-matalb-function-block-in-simulink

评论： gdz 2023-2-1

Hi,

I would like to use Simulink to do some calculation. In Simulink, there is a constant block sending the input, passing to the MATLAB function, and display the output in a Display block. The function has been tested and worked well on MATLAB, but an error occur in simulink:

Simulink does not have enough information to determine output sizes for this block. If you think the errors below are inaccurate, try specifying types for the block inputs and/or sizes for the block outputs.

%MATLAB function
function y = fcn(u)
B = 0;
A = 100*(10/u-1); 
F=@(x)[6*exp(-39*10^(-3)*x)+230*exp(-6*10^(-5)*x)-A];
B = fsolve(F,0,optimoptions('fsolve','Algorithm','levenberg-marquardt'));
y = B;

Any suggestion will be appreciated. Thank you.

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Answer 1

Fangjun Jiang 2023-1-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1902935-output-sizes-for-matalb-function-block-in-simulink#answer_1160445

It is interesting that you want to do this. Does the solution "B" always exist? How many solutions are there and are there always the same number of solutions?

Anyway, those questions are related to the error message. You could try to resolve it this way. In the M Editor, click menu button "Edit Data" and set the size of "B" or "y" or both.