What is wrong with this "ind" loop for a 2D array?

Hi, dear NCL users,

Would you please give me some hint of what is wrong with the "ind" loop for a 2D array as shown below?

Thanks a lot.

Shawn

################################################################

When I run it, it shows:
fatal:Subscript out of range, error in subscript #0
fatal:An error occurred reading fog
fatal:Execute: Error occurred at or near line "FOG = fog(ii,jj)" in the file

################################################################

;--fog is a nrows*ncols 2D array.
;--Get indices where fog value is 1, that is fog happens.
    ii = new(nrows,integer)
    jj = new(ncols,integer)
    do i=0,nrows-1
       do j=0,ncols-1
          ii(i) = ind(fog(i,j).eq.1)
          jj(j) = ind(fog(i,j).eq.1)
       end do
    end do

 FOG = fog(ii,jj)
 ;Debug print
 print(FOG)

#################################################################

Wen.J.Qu
2012-09-26

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Received on Wed Sep 26 23:54:41 2012