User`s manual

2 Creating C Language MEX-Files
2-8
{
y[0] = 2.0*x[0];
return;
}
Below is the same function written in the MEX-file format.
#include "mex.h"
/*
* timestwo.c - example found in API guide
*
* Computational function that takes a scalar and doubles it.
*
* This is a MEX-file for MATLAB.
* Copyright (c) 1984-2000 The MathWorks, Inc.
*/
/* $Revision: 1.8 $ */
void timestwo(double y[], double x[])
{
y[0] = 2.0*x[0];
}
void mexFunction( int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[] )
{
double *x,*y;
int mrows,ncols;
/* Check for proper number of arguments. */
if(nrhs != 1) {
mexErrMsgTxt("One input required.");
} else if(nlhs > 1) {
mexErrMsgTxt("Too many output arguments");
}
/* The input must be a noncomplex scalar double.*/
mrows = mxGetM(prhs[0]);
ncols = mxGetN(prhs[0]);