[gradsusr] Grads vertical derivative error with cdiff

[Aishwarya]

I dont think so. It is a WRF generated output.

On Mon, May 7, 2012 at 11:57 AM, Thomas Robinson <ter at hawaii.edu> wrote:

> Aloha,
>
> does your geopotential equal gz?
>
> d(geopot)/dz=d(gz)/dz=gdz/dz=g
>
> This is a constant and would yield a straight line with the value of g.
>
> On Mon, May 7, 2012 at 4:49 AM, Aishwarya <spaceaish at gmail.com> wrote:
>
>> Thank you. BUt if i set one specific level (say 500mb) and perform finite
>> diference, i find a straight line!
>>
>> On Sun, May 6, 2012 at 6:44 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:
>>
>>> 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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>>>
>>
>>
>> --
>> *Aishwarya,
>> Graduate Research Assistant,
>> Atmospheric Sciences,
>> University of Arizona,Tucson.*
>>
>>
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>>
>>
>
>
> --
> Tom Robinson
> President Graduate Student Organization
> Student Caucus Representative for the Graduate Student Organization
> Graduate Student - Department of Meteorology
> 732-718-2323
>
>
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>


-- 
*Aishwarya,
Graduate Research Assistant,
Atmospheric Sciences,
University of Arizona,Tucson.*
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