Re: [Opengrads-devel] PyGrads tarball

[Arlindo da S. <da...@al...>]

On Jan 4, 2008 10:36 AM, Arlindo da Silva <da...@al...> wrote:

> All,
>
>   I just placed a pygrads tarball on http://opengrads.org/pre-rel if you
> would like to give it a try. (So far tested on Mac OS X, Mandriva 2008 and
> Fedora 7).
>

I just replaced the tarball with v1.0.7 that includes bug fixes I did over
the weekend. I also included ganum_examples.py which exercises the NumPy
dependent portion of the package, in particular the EOF calculator and the
least square estimator.

Another important update is that I redesigned the class that represents a
grads field in python. GaField is now a subclass of the
numpy.ma.MaskedArrayclass and most of the algebraic operators have
been overloaded (some issues
with slicing still remains but it is not critical). This greatly simplifies
the syntax:

ts = ga.exp('ts')   # export 'ts' to python
ts = ts - 273 # change units in python
ga.imp('tc',ts)  # put it back into grads as defined variable "tc"

You can display it in GrADS:

ga("display tc")

or with Matplotlib:

ga.imshow(ts)

The "grid" attribute containing coordinate variables and the like are now
fairly hidden. Also, GaField are masked arrays, so it works pretty much as
in GrADS v2.

One last feature is that the grads object is now "callable", so these 2 are
equivalent:

ga.cmd("display ts")
ga("display ts")

I have not update the wiki, but the docstrings should be current.

            Arlindo





-- 
Arlindo da Silva
da...@al...