mxCreateSparse returning an empty matrix

Hello I want to create a sparse matrix in c/mex and use it in matlab but I have a problem with mxCreateSparse function. I wrote the below code in c and called it from matlab. But it is creating a 4x2 zeros sparse. I don't know why it is happening. And, When I tried to open that empty sparse matrix, Matlab crashed immediately. Please help me to identify the error. Thanks in advance.

#include <math.h>
#include <stdlib.h>
#include "mex.h"
#include "matrix.h"
#include <stdio.h>
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]){
  double Ap[4] = {5.8, 6.2, 5.9, 6.1}, *cAp;
  int Ai[4] = {0, 2, 1, 3}, *cAi ;
        int Ax[3] = {0, 2, 4}, *cAx ;
  mxArray *pargout;
    pargout = mxCreateSparse (4, 2, 4, mxREAL) ;

        cAp = (double *)mxGetPr(pargout);
        memcpy(cAp, Ap, 4*sizeof(double));

      cAi = (int *)mxGetIr(pargout);
      memcpy(cAi, Ai, 4*sizeof(int));

      cAx = (int *)mxGetJc (pargout) ;
      memcpy(cAx, Ax, 4*sizeof(int));

      plhs[0] = pargout;
  }