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http://www.mathworks.com/access/helpdesk/help/techdoc/apiref/mexfunction.html
mexFunction (C and Fortran) -
Entry point to C/C++ or Fortran MEX-file
C Syntax
#include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs,
const mxArray *prhs[]);
Fortran
Syntax
subrouti ......