Want to calculate d/dy

Hi,

I have CAM ouput in T85 resolution. I want to calculate d/dy of a term.
I looked at a function called "gradsg" but I couldn't understand if I
can use it. Is there any other way in NCL for doing that?

Thanks,
Soumik

-- 
"Numbing the pain for a while will make it worse when you finally feel 
it.
  ~J.K. Rowling"
*****************************************
Soumik Basu
Graduate Student, Research Assistant
International Arctic Research Center
University of Alaska Fairbanks
Fairbanks,Alaska,USA
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