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?

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 . 2024-12-20 19:45:00

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.

Not satisfied with the answer ?? ASK NOW

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