Why do I receive the error "Mex file entry point is missing?"

When I try to compile my foo.c, I receive an error like the following:

Mex file entry point is missing. Please check the (case-sensitive)

spelling of mexFunction (for C MEX-files), or the (case-insensitive)

spelling of MEXFUNCTION (for FORTRAN MEX-files).

??? Invalid MEX-file

Answer 1

[MathWorks Support Team]

This error is due to the fact that "mexFunction" or the parameters may be incorrect. Make sure you have:

void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[] )

In order to have a valid mex source code, the above function needs to replace "main()" with "void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[] )"

For more information, see:

https://www.mathworks.com/help/releases/R13sp2/techdoc/matlab_external/ch03crea.html#calling_from_matlab

Under "Examples of C MEX-files".