[gradsusr] issue in exporting and expression, change it in Python and import back

[Helio Camargo]

On Mon, Oct 3, 2011 at 10:26 PM, Arlindo da Silva <dasilva at alum.mit.edu>wrote:

>
>
> On Mon, Oct 3, 2011 at 9:06 PM, Helio Camargo <heliocamargo at gmail.com>wrote:
>
>> Dear gradsusr,
>>
>> Just before mentioning the error, I like to emphasize that the environment
>> variables GAUDXT and LD_LIBRARY_ PATH are (apparently) properly set in my
>> .bashrc.
>>
>>
> If you are using the opengrads bundle, you should *not* set any of these;
> just put Contents/ in your path.
>

Hi Arlindo,

Thanks for the response.

Fixed it! Error persists though...



>
>
>
>> I've been struggling a bit just to follow a pygrads example available in
>> http://opengrads.org/wiki/index.php?title=PyGrADS_Interactive_Shell .
>> Everytime I want to export and expression, change it in Python and import
>> back I get the following message:
>>
>>
> Which version of pygrads are you using?  Which platform? Are using EPD? If
> so, which version?
>

I'm using pygrads-1.1.0. I'm trying the same thing on a Mac OS X 10.6.7 and
on a Ubuntu...one thing is that I couldn't find the folder Contents in
Ubuntu, but I pointed the path of the grads executable in the
path...actually both of them return exactly the same error message I copied
in my last e-mail...and no, I'm not using any EPD...

Thanks again!



>
>    Arlindo
>
>
>
>>
>> ***********
>> iuser at iuser-Dell-System-Vostro-3450:~$ pygrads
>>
>>   Welcome to PyGrADS, a GrADS-based iPython environment.
>>
>> Grid Analysis and Display System (GrADS) Version 2.0.a9.oga.1
>> Copyright (c) 1988-2010 by Brian Doty and the
>> Institute for Global Environment and Society (IGES)
>> GrADS comes with ABSOLUTELY NO WARRANTY
>> See file COPYRIGHT for more information
>>
>> Config: v2.0.a9.oga.1 little-endian readline printim grib2 netcdf hdf4-sds
>> hdf5 opendap-grids,stn athena geotiff shapefile
>> Issue 'q config' command for more detailed configuration information
>> Loading User Defined Extensions table
>> </opt/opengrads/Linux/Versions/2.0.a9.oga.1/i686/gex/udxt> ... ok.
>> GX Package Initialization: Size = 11 8.5
>>
>>
>>    Welcome to PyGrADS, a GrADS-based iPython environment.
>>    For more information, type 'help(ipygrads)'
>>
>> ?         -> Introduction and overview of IPython's features.
>> help      -> Python's own help system.
>> qref      -> PyGrADS quick reference
>> examples  -> Some PyGrADS examples
>> object?   -> Details about 'object'. ?object also works, ?? prints more.
>>
>>
>>
>>  [2] ga-> o model
>> Scanning description file:  model
>> Data file model.grb is open as file 1
>> LON set to 0 360
>> LAT set to -90 90
>> LEV set to 1000 1000
>> Time values set: 1987:1:1:0 1987:1:1:0
>> E set to 1 1
>>
>>
>>  [3] ga-> . q dims
>> Default file number is: 1
>> X is varying   Lon = 0 to 360   X = 1 to 73
>> Y is varying   Lat = -90 to 90   Y = 1 to 46
>> Z is fixed     Lev = 1000  Z = 1
>> T is fixed     Time = 00Z01JAN1987  T = 1
>> E is fixed     Ens = 1  E = 1
>>
>>
>>  [4] ga-> . set lev 300
>> LEV set to 300 300
>>
>>
>>  [5] ga-> uv = ga.exp('ua*ua+va*va')
>>
>>  [6] ga-> speed = sqrt(uv)
>>
>>  [7] ga-> ga.imp('speed', speed)
>>
>> ------------------------------------------------------------
>> Traceback (most recent call last):
>>   File "<ipython console>", line 1, in <module>
>>   File "/usr/local/lib/python2.7/dist-packages/grads/ganum.py", line 336,
>> in imp
>>     t1_, z1_ = (grid.denv.t[0], grid.denv.z[0])
>> AttributeError: 'NoneType' object has no attribute 't'
>>
>>
>>  [8] ga-> ga.imp('speed', speed)
>> ^[[A
>> ^C------------------------------------------------------------
>> Traceback (most recent call last):
>>   File "<ipython console>", line 1, in <module>
>>   File "/usr/local/lib/python2.7/dist-packages/grads/ganum.py", line 298,
>> in imp
>>     dh = self.query("dims", Quiet=True)
>>   File "/usr/local/lib/python2.7/dist-packages/grads/gacore.py", line 494,
>> in query
>>     self.cmd('query '+what,Quiet)
>>   File "/usr/local/lib/python2.7/dist-packages/grads/gacore.py", line 241,
>> in cmd
>>     rc = self._parseReader(Quiet)
>>   File "/usr/local/lib/python2.7/dist-packages/grads/gacore.py", line
>> 1051, in _parseReader
>>     got = self.Reader.readline()
>> KeyboardInterrupt
>>
>>
>>  [9] ga->
>> ^C
>> ************
>>
>> The funny thing is that after I try it once, the second try gets stuck and
>> only CTRL+C returns the prompt back...
>>
>> Any hint on what can be going on will be very welcome.
>>
>> Thx in advance,
>>
>> --
>> Helio
>>
>> _______________________________________________
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>> gradsusr at gradsusr.org
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>>
>>
>
>
> --
> Arlindo da Silva
> dasilva at alum.mit.edu
>
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>
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