#include "mex.h"

void
mexFunction (int nlhs, mxArray* plhs[], int nrhs, const mxArray* prhs[])
{
  int i, j;
  mxArray *v;
  const char *keys[] = { "this", "that" };

  if (nrhs != 1 || ! mxIsStruct (prhs[0]))
    mexErrMsgTxt ("expects struct");

  for (i = 0; i < mxGetNumberOfFields (prhs[0]); i++)
    for (j=0; j < mxGetNumberOfElements(prhs[0]); j++)
      {
	mexPrintf ("field %s(%d) = ", mxGetFieldNameByNumber (prhs[0], i), j);
	v = mxGetFieldByNumber (prhs[0], j, i);
	mexCallMATLAB(0, 0, 1, &v, "disp");
      }

  v = mxCreateStructMatrix (2, 2, 2, keys);

  mxSetFieldByNumber (v, 0, 0, mxCreateString ("this1"));
  mxSetFieldByNumber (v, 0, 1, mxCreateString ("that1"));
  mxSetFieldByNumber (v, 1, 0, mxCreateString ("this2"));
  mxSetFieldByNumber (v, 1, 1, mxCreateString ("that2"));
  mxSetFieldByNumber (v, 2, 0, mxCreateString ("this3"));
  mxSetFieldByNumber (v, 2, 1, mxCreateString ("that3"));
  mxSetFieldByNumber (v, 3, 0, mxCreateString ("this4"));
  mxSetFieldByNumber (v, 3, 1, mxCreateString ("that4"));

  if (nlhs)
    plhs[0] = v;
}