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

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!

[Paresh yeole]

Also add the mex file of the sfun to the path

[Sergio]

check if running matlab as an administrator (right click on the icon and run as an administrator) solves the problem. It worked for me

Answer 1

[Mark McBroom]

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

[Peter Dauksch]

We actually found a mex32 file... (The model was created in a older version on a different computer)

But since it is now a 64 bit system this might be the issue!

Thank you!