From Sidey Timmins <timmins@forest.gsfc.nasa.gov> Tue Oct 17 18:07:16 2000
From: Sidey Timmins <timmins@forest.gsfc.nasa.gov> (Sidey Timmins)
Date: Tue, 17 Oct 2000 13:07:16 -0400 (EDT)
Subject: [Matrix-SIG] How to a la IDL, TV, matrix_array
Message-ID: <200010171707.NAA16554@forest.gsfc.nasa.gov>
Hi:
As a new pythoner I am very impressed with Numpy.
But surely you can (via Tkinter) display a raster matrix easily.
(I dont want to write a file and then display a jpeg etc with the imaging
lib)
How do you display the matrix on the Numpy Topic guide page ?
(http://www.python.org/topics/scicomp/numpy.html):
>>> from Numeric import * # load NumPy
>>> xs = arange(-6, 6, .02) # create X indices
>>> ys = arange(-6, 6, .02)[:,NewAxis] # create Y indices
>>> sinx = sin(xs) # sin() on each
element of xs
>>> yx = cos(ys)*exp(-ys*ys/18.0) # same sort of thing
>>> zx = xs * xs # elementwise
multiplication
which results in an array zx which looks something like:
?????
Sidey Timmins
Code 923, Biospheric Sciences
NASA/GSFC Greenbelt Md
From ransom@cfa.harvard.edu Tue Oct 17 18:43:07 2000
From: ransom@cfa.harvard.edu (Scott Ransom)
Date: Tue, 17 Oct 2000 13:43:07 -0400
Subject: [Matrix-SIG] How to a la IDL, TV, matrix_array
References: <200010171707.NAA16554@forest.gsfc.nasa.gov>
Message-ID: <39EC8FAB.E559A176@cfa.harvard.edu>
Sidey Timmins wrote:
>
> As a new pythoner I am very impressed with Numpy.
> But surely you can (via Tkinter) display a raster matrix easily.
> (I dont want to write a file and then display a jpeg etc with the imaging
...
> which results in an array zx which looks something like:
Hi Sidey,
One option (especially since you work at NASA where PGPLOT is certainly
installed) is to use the ppgplot and Pgplot modules available from here:
ftp://cfa-ftp.harvard.edu/pub/ransom/
The ppgplot library wraps PGPLOT, and Pgplot is an easy-to-use set of
Python procedures to do interactive plotting (ala IDL).
In your case you would simply do:
from Pgplot import *
plot2d(zx)
to get a plot in an X-window
Postscript output, contours, different color schemes, labeling, etc.,
are only keywords away.
There are other options, of course, see this page for a list:
http://www.python.org/topics/scicomp/plotting.html
Hope this helps,
Scott
--
Scott M. Ransom Address: Harvard-Smithsonian CfA
Phone: (617) 495-4142 60 Garden St. MS 10
email: ransom@cfa.harvard.edu Cambridge, MA 02138
GPG Fingerprint: 06A9 9553 78BE 16DB 407B FFCA 9BFA B6FF FFD3 2989
From cgw@fnal.gov Tue Oct 17 18:50:39 2000
From: cgw@fnal.gov (Charles G Waldman)
Date: Tue, 17 Oct 2000 12:50:39 -0500 (CDT)
Subject: [Matrix-SIG] How to a la IDL, TV, matrix_array
In-Reply-To: <39EC8FAB.E559A176@cfa.harvard.edu>
References: <200010171707.NAA16554@forest.gsfc.nasa.gov>
<39EC8FAB.E559A176@cfa.harvard.edu>
Message-ID: <14828.37231.409962.745221@buffalo.fnal.gov>
Scott Ransom writes:
> Sidey Timmins wrote:
> >
> > As a new pythoner I am very impressed with Numpy.
> > But surely you can (via Tkinter) display a raster matrix easily.
> > (I dont want to write a file and then display a jpeg etc with the imaging
> ...
> > which results in an array zx which looks something like:
If you install install PIL (Python Imaging Library) you can easily
do this using the "tostring" and "fromstring" functions.
Search the archives, I believe this has been discussed before.
From mmiller3@iupui.edu Tue Oct 17 22:02:03 2000
From: mmiller3@iupui.edu (Michael A. Miller)
Date: 17 Oct 2000 16:02:03 -0500
Subject: [Matrix-SIG] How to a la IDL, TV, matrix_array
In-Reply-To: Sidey Timmins's message of "Tue, 17 Oct 2000 13:07:16 -0400 (EDT)"
References: <200010171707.NAA16554@forest.gsfc.nasa.gov>
Message-ID: <87u2abji5w.fsf@lumen.med.iupui.edu>
>>>>> "Sidey" == Sidey Timmins <timmins@forest.gsfc.nasa.gov> writes:
> How do you display the matrix on the Numpy Topic guide
> page?
Look for the NumTut package:
>>> Import NumTut
>>> NumTut.view(zx)
The NumTut link at
http://www.python.org/topics/scicomp/documentation.html is
broken. Does anyone know where it can be found these days? I
can tar up a copy of what I've got if anyone whants it.
Mike
--
Michael A. Miller mmiller3@iupui.edu
Krannert Institute of Cardiology, IU School of Medicine
Indiana Center for Vascular Biology and Medicine