Memory leak with array overwriting

hello all,

I am running NCL 5.0.0

I have a 2D array, cprmask(x,z), and want to rotate the contents of each
x-slice to the right by "nshift" places with cyclic boundary conditions.

As nshift itself is a function of height, I resorted to a Do-Loop as
follows:

    do i=0,nhgtr-1
      nshift = round(hgtr(i)*tan_sza_dx,3)
      index = mod(ispan(0,npts-1,1)+nshift,npts)
      shiftmask(:,i) = cprmask(index,i)
      delete(index)
    end do

This works, BUT I suffer from a nasty memory leak problem that is not
allowing be to run the program for large amounts of data, despite the
fact that I also have a "delete(shiftmask)" statement later in the
"mother" do loop.

does anyone have any ideas how to prevent the memory leak?

thanks,

Adrian

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