Receiving inputs from MATLAB:

/*** Begin receive.c ***/
/* This program receives an mxArray from MATLAB (automatically sent 
 * through prhs[]), gets a C pointer to it and prints out the value.
 */

#include "mex.h"
void mexFunction (int nlhs, mxArray *plhs[], int nrhs, mxArray *prhs[])
{
  double *dummy;
  
  dummy = mxGetPr(prhs[0]);

  /* dummy is now a regular C pointer */
  mexPrintf("### input is %g ###\n", dummy[0]);
}

/***  End receive.c ***/


Compiling and running the receive.c in MATLAB:

» mex receive.c
» mextest(234)
### input is 234 ###
» 



Sending outputs to MATLAB:

/*** Begin mexout.c ***/
/* This file creates an mxArray, assigns it to the output mxArray 
 * pointer plhs[0]; then gets a C "double" pointer to plhs[0] and sets 
 * it's value to 987.
 * The
 */



#include "mex.h"
void mexFunction (int nlhs, mxArray *plhs[], int nrhs, mxArray *prhs[])
{
  double *dummy;
  
  plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);
  dummy = mxGetPr(plhs[0]);
  dummy[0] = 987; 
}

/***  End mexout.c  ***/



Compiling and running mexout.c in MATLAB:

» mex mexout.c
» mexout
ans =
   987
» 

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