//e_m matrix
   for(i=0;i<ROWS;i++){
    for(j=0;j<COLS;j++){
      e_m[i+ROWS*j].r = real[i][j];
      e_m[i+ROWS*j].i = imag[i][j];  //defined cols-by-cols
       }
   }
//creation of nullmatrix
   for(i=0;i<COLS;i++){
          for(j=0;j<COLS;j++)
          {
            nullm[i][j]= 0;
             }
         }