[gradsusr] Grads vertical derivative error with cdiff

[Jeff Duda]

You can't use cdiff in the vertical.  You must calculate the derivative
using a manual centered difference.  For example, 'd
0.5*(geopot(z+1)-geopot(z-1))'

Jeff Duda

On Sun, May 6, 2012 at 7:32 PM, Aishwarya <spaceaish at gmail.com> wrote:

> Hi,
>
> I'm trying to find vertical derivative of geopotential (geopt). I tried d
> cdiff(geopt,z), i find the error :
> Error from CDIFF:  Specified dimension non varying
> Operation Error:  Error from cdiff function
>   Error ocurred at column 1
> DISPLAY error:  Invalid expression
>   Expression = cdiff(u,z)
>
> Any help would be great!
>
> Thank you,
> -------
> *Aishwarya,
> Graduate Research Assistant,
> Atmospheric Sciences,
> University of Arizona,Tucson.*
>
>
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>


-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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