How to re allocate memory in the same array using mxRealloc?

I'm trying to do some calculations in my code wherein I want to append data in respective double arrays after each iteration. For Ex.

double *outliers, *zerodata;
int index,i,j;
for(j = 0; j< index; j++)
{
  for(i=0; i<100; i++)
  {
    doing calculations and saving in temporary arrays;
  }
  if(index==1)
  {
   outliers = mxCalloc(100,mxREAL);
   zerodata = mxCalloc(100,mxREAL);
   inserting temporary data into outliers and zerodata;
  }
  else
  {

   }
 }

Can I do something like this in the else part

outliers = mxRealloc(outliers,(outliers+100) * sizeof(*outliers));

I would want to keep appending data in outliers and zerodata array.