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ginni asked . 2021-09-11

Can I have more than 1 output argument from a function that I use in the MATLAB Function block in Simulink?

Can I have more than 1 output argument from a function that I use in the MATLAB Function block in Simulink?
I have a user written function that has multiple input and output arguments. For example:
[a,b,c,d] = my_function(x,y,z)

But when I try to use this in the MATLAB FCN block in Simulink I get the following error:

 ??? Error using ==> sim

 Error in MATLAB Function block 'my_model/MATLAB Fcn' while 

 computing the output. The width of the result was 1 when a width of 4 was 

 expected.

I have specified the number of outputs from the block as 4. But only one output from the function is seen.

simulink , matlab , function , block , fcn

Expert Answer

John Williams answered . 2024-04-26 06:45:05

I believe the link might be complicated for some people so I will suggest a simple solution from the R2021a version that I used to save people some time.
  • On the MATLAB FCN block, if you hover over to the edges that input and outputs are located in, u can see a plus indicator. Once you click and hit enter, you can easily add inputs and outpus to the amount you desire.
  • If you double click the block you can copy and paste your script to use in the SIMULINK model,
I am not that experienced in SIMULINK so if a more automated way is requiered, than you might find salvation in reading through the link above.


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