uv2vr_cfd, but only want dv/dx ?

Hi.
I used uv2vr_cfd function for calculating relative vorticity.
http://www.ncl.ucar.edu/Document/Functions/Built-in/uv2vr_cfd.shtml

I only want the dv/dx part values. Is there a simple way of getting
these values (this part of equation only) from the resulting values?
Thank you for the help.
Sincerely,
Erik
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Received on Fri Oct 28 21:19:17 2011