backward difference

Dear NCL users,

I'd like to perform a simple backward difference for zonal wind data in
order to produce acceleration term: dU/dt= U(t)-U(t-1).

Any helps would be really appreciated.
Thanks

-- 
Regards,
Dr. Verena.
School of Marine and Atmospheric Sciences
Stony Brook University
homepage: http://www.somas.stonybrook.edu/

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Received on Mon Jan 27 06:52:30 2014