Pygrads and grads executables

[Arlindo da Silva]

On Wed, Mar 19, 2008 at 10:43 AM, Roch, Grant F. <
Grant.Roch at constellation.com> wrote:

>  Arlindo-
>
> I downloaded pygrads-1.0.8.win32_superpack.exe and installed everything
> without issue.  I'm trying to play around with the python interface but come
> across some issues starting the executables.
>
Did you install the GrADS executables, in particular the win32 superpack?
Before you can use PyGrADS you should be able to open a cmd.exe window and
type

C:\> gradsnc

and have vanilla GrADS fully functional. PyGrADS just uses bi-directoional
pipes to mcommunicate with these executables.


> I'm trying the examples provided on the wiki, but the GaCore(Bin='grads')
> or GaCore(Bin='gradsnc') or GaNum(Bin='grads') don't work.  I've let them
> run for several minutes (one time a half hour) and kill them and here's the
> trace back:
>
When it works, it should be immediate. Come to think of it, I should add
some explicit timeouts to the code...

...


> I'm plotting grib files.
>
I'll be soon releasing an extension for reading grib-2 files in grads
v1.9.0-rc1, as a stop gap measure until we can transition the OpenGrADS
development to GrADS v2. Contact me directly if you would like to help us
with the early testing.


> I've done some scripting in GrADS but am excited to try this interface
> out.  How long will it before this the PyGrADS works with GrADS v2?
>
>
This is more a question for COLA than for me.  I need the ability to write
dynamic extensions in order to implement all the PyGrADS functionality (in
particular the fast exchange of variable data).  So, I am waiting for COLA
to define the dynamic UDF Application User Interface (API) before  this and
other OpenGrADS projects can make a switch to GrADS v2.

I don't know if you realize, but the basic functionality in GaCore (without
numpy/pylab interfaces) already works with GrADS v2; you simply cannot
exchange variable data with Python transparently. In fact, I have
implemented a test suite for GrADS v2 based on GaCore and PyUnit.

> Thanks for any assistance you can provide.  Should this be posted on the
> Open GrADS mailing list in the future?  I was going to but didn't seem like
> there's much posted there (at least in comparison to the GRADS user list).
>

For now, send questions like this to the regular gradsusr list. If we ever
get to a point of too much traffic, or the discussions get too python
specific, then it may justify to have specialized mailing list.

    Arlindo





>
> Grant F. Roch
> CCG Strategies Group
> W: 410-470-2565
> C: 443-670-4951
>
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>


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