"S-Function does not exist" but is clearly in the Matlab path!

Question

Peter Dauksch 2021-2-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/735042-s-function-does-not-exist-but-is-clearly-in-the-matlab-path

评论： Peter Dauksch 2021-2-8

Hello,

I am working with a huge simulink model that uses a lot of custom library blocks and S-functions.

But 3 of them dont work, the error is just: "Error in S-function 'modelname/subsystem/block': S-Function 'sfun_name' does not exist"

But I have a folder in my model library with the files name.cpp, name.h, sfun_name.cpp and also the simulink model of the library block.

This folder is definetely added to the path, I checked with the path command

It used to work but now simulink says these S-functions do not exist, but they do.

I tried to replace the blocks from the library but it did not help.

Does anyone have an idea about this? Or what else would I need to provide? (I am not allowed to upload any files from the model)

Thank you!

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Paresh yeole 2021-2-3

Also add the mex file of the sfun to the path

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Answer 1

Mark McBroom 2021-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/735042-s-function-does-not-exist-but-is-clearly-in-the-matlab-path#answer_614202

Do you have a file named sfun_name.mexw64? Simulink needs the s-function to be compiled into a mexw64( which is a specialzed DLL). If you don't have a .mexw64, then you will need to create one by compiling your C code into a mexw64 file with the "mex" command. https://www.mathworks.com/help/matlab/ref/mex.html?searchHighlight=mex&s_tid=srchtitle

mex sfun_name.cpp