/*MEX function example,create random numbers——randomnum.c*/
#include "mex.h"
/*MEX function entrance*/
    void mexFunction(int nlhs,mxArray *plhs[],int nrhs,const mxArray *prhs[])
    {
        double *m,*n,*flag;
        /*error detecting*/
        if(nlhs>1||nrhs!=3)
    mexErrMsgTxt("error:wrong numbers of input/output!");
    m=mxGetPr(prhs[0]);
    n=mxGetPr(prhs[1]);
    flag=mxGetPr(prhs[2]);
    plhs[0]=mxCreateDoubleMatrix(*m,*n,mxREAL);
    /*set output flag*/
    mexSetTrapFlag(*flag);
    /*wrong transfer-->function rnd does not exsit*/
        mexCallMATLAB(1,plhs,2,prhs,"rnd");
        /*continue to run MEX function file so rand function is transfered by MEX file*/
        mexPrintf("user set Flag to 1.\n");
        /*rright transfer*/
        mexCallMATLAB(1,plhs,2,prhs,"rand");
        }