import a grads variable that has a fixed dimension in lon/lat

[Arlindo da Silva]

Hi,
I need to know versions of grads and pygrads you are working with.

   Thanks,

        Arlindo

On Thu, May 14, 2009 at 10:29 AM, Hai-Ru Chang <hrc at eas.gatech.edu> wrote:

> Hello,       I tried import a defined grads variable with fixed dimension
> on latitude and longitude and varied dimension on time and ensemble members.
>  When I  tried to export the variable to python, I saw the following error
> messages
>
> Traceback (most recent call last):
>   File "nino3_4_pnct.py", line 25, in <module>
>     sstpcnt = ga.exp("sstpcnt")
>   File
> "/home/scripting/ext/Linux/lib/python2.5/site-packages/grads/ganum.py", line
> 112, in exp
>     return self._exp2d(expr)
>   File
> "/home/scripting/ext/Linux/lib/python2.5/site-packages/grads/ganum.py", line
> 232, in _exp2d
>     'invalid exchange metadata (idim,jdim)=(%d,%d) - make sure <%s> is
> valid and that lon/lat is varying.'%(id,jd,expr)
> grads.gacore.GrADSError: 'invalid exchange metadata (idim,jdim)=(-1,-1) -
> make sure <sstpcnt> is valid and that lon/lat is varying.'
>
> I have two questions.  First, can I export a defined grads variable to a
> numpy array?
>

Yes.


> Second, can I only export a grads variable that is varying in latitude and
> longitude?
>

Yes. In fact, if using exp() it *must* be varying in lat/lon.

       Arlndo


>
>
> Dr. Hai-Ru Chang
>
> School of Earth and Atmospheric Sciences
>
> Georgia Institute of Technology
>
> Atlanta, GA 30332-0340
>
>
>
>


--
Arlindo da Silva
dasilva at alum.mit.edu
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