How to accomplish a loop with negative stride?

Hi, all

Would you please give some suggestions on how to accomplish a loop with negative stride? Just as below?

Thanks a lot.

Shawn

**************************************************
   do i=lon90,lon180
        n588(year_index,day_index,i)=0.0
             do j=lat80,lat10,-1
                  if((h(year_index,day_index,j,i)/10.0 .le. 588.0) .and. (h(year_index,day_index,j-1,i)/10.0 .le. 588.0))then
                       n588(year_index,day_index,i)=j
                       break
                  end if
             end do
   end do
**************************************************

Wen.J.Qu
2012-10-22

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Received on Mon Oct 22 16:15:49 2012