Unrecognized function or variable

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.

[Steven Lord]

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]

Yes, I am using 64 bit Windows.

Answer 1

[Sai Teja G]

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.

https://www.mathworks.com/help/simulink/sfg/s-function-builder-dialog-box.html

Hope this resolves your query!

Best Regards,

Sai Teja G