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

Tue Oct 4 09:55:34 EDT 2011

On Tue, Oct 4, 2011 at 12:18 AM, Helio Camargo <heliocamargo at gmail.com>wrote:

>
>
>
> 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?
>>
>
>
EPD is not necessary.

> I'm using pygrads-1.1.0.
>

This is very old. The current version is 1.1.b5 which you get from here:

      http://sourceforge.net/projects/opengrads/files/python-grads/1.1.b5/

Give this a try and if the problem persists, get back to me.

    Arlindo

> 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
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
>>
>> --
>> Arlindo da Silva
>> dasilva at alum.mit.edu
>>
>> _______________________________________________
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>>
>>
>
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-- 
Arlindo da Silva
dasilva at alum.mit.edu
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