Do loop overwriting

I have a time loop (shown below) that reads variables from 2 different files
and subtracts them.

I want to store this subtraction in a newly created array (arr) whose
leftmost dimension will account for each of the loops and the other two
dimensions will be the 2 dimensions of the original variables (x1 and x2).

So basically arr(0,:,:) will be the subtraction values of the first loop;
                   arr(1,:,:) will be the same for the second loop; and so
on.

But each time a new loop comes about, it stores the right values in the
right place, but overwrites the ones stored in the previous loop, replacing
them with the value assigned as _FillValue. Is there a way to "save" what
has been stored in the previous loops and avoid this overwriting?

Thanks a lot!!!

 *do nt1=1,10
 nt2=6*nt1

  x1 = wrf_user_getvar(f1,"slp",nt1)
** x2 = wrf_user_getvar(f2,"slp",nt2) *
*
  y = x2-x1

  arr = new( (/10, 100, 100/), "float" )
  arr(nt1-1,:,:) = y

  end do*

-- 
*Paula Doubrawa Moreira**
*Graduate Student - Research Assistant
International Arctic Research Center
University of Alaska Fairbanks

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Received on Thu Jul 29 12:09:42 2010