[gradsusr] vertical derivative

[Chase Norton]

Shing

Chase Norton

On Jun 25, 2011, at 8:43 PM, Shing <midicarcas at gmail.com> wrote:

> hi 
> 
> i want to take vertical derivative of humidity in the isobaric coordinates. i used the function cdiff:
> 
> 
> define dq=cdiff(q,z)
> 
> but got error message saying 
> error from cdiff: specific dimension non varying
> operation error: error from cdiff function
> error occurred at column 1
> define error: invalid expression
> 
> it works fine when i take horizontal derivatives, such as dq=cdiff(q,x) and dq=cdiff(q,y)
> 
> is it not the way to do vertical derivative in grads?
> 
> thank you very much!
> 
> shing
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