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Unrecognized function or variable

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Suvo Ganguli
Suvo Ganguli on 5 Mar 2021
Answered: Sai Teja G on 13 Oct 2023
I have an s-function called smn_sfunc_gam_mpass_epsposdef.mexw64'.
When I try to simulate the s-function in Simulink, I am getting an error:
"Unrecognized function or variable 'smn_sfunc_gam_mpass_epsposdef'"
I am giving the command in the same folder as that of the s-function, so path should not be an issue.
Any idea what's going on?
Thanks.
  2 Comments
Steven Lord
Steven Lord on 5 Mar 2021
This may seem like an obvious question, but are you running Simulink on a 64-bit version of Windows? Files with the .mexw64 extension only run on 64-bit Windows.
Suvo Ganguli
Suvo Ganguli on 5 Mar 2021
Yes, I am using 64 bit Windows.

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Answers (1)

Sai Teja G
Sai Teja G on 13 Oct 2023
Hi Suvo,
I understand that you are facing an error while simulating the S-function in the Simulink.
Since you haven't shared the file, it is possible that the error is caused by the following reasons:
  1. MATLAB may not automatically search the current working directory for functions or variables, even if you are executing the command in the same folder as the S-function. To resolve this, you can use the “addpath()” command to explicitly add the S-function's directory to the MATLAB search path.
  2. The "Unrecognized function or variable" error can occur if the S-function is not built or compiled correctly. Ensure that you have compiled the S-function using the appropriate build process or command. Refer to the documentation or instructions provided with the S-function for the correct steps to build it. Refer to the documentation or instructions provided with the S-function for the correct steps to build it.
Hope this resolves your query!
Best Regards,
Sai Teja G

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