[GRASS-dev] matplotlib example script

[Michael Barton]

I've attached an example script and output for using the MatPlotLib  
Python library in GRASS. This script replicates the functionality of  
d.histogram, but makes a much nicer looking plot. It also has more  
options, although I've included only a very few of the formatting  
possibilities here. The script sends the output from r.stats into 9  
lines of code to produce the histogram with formatting options. Most  
of it is done by 4 lines. This can be run from the command line and  
does not require a GUI to be installed. It writes to a PNG file, but  
could easily be set to create a TclTk or wxPython interactive window  
as a user-selectable option.

The following command produces the attached histogram:

histogram_mpldemo.py input=elevation.10m bins=25 output="/users/ 
cmbarton/documents/myhistogram" fillcolor=20:20:200

Maybe I'll try an xy graph of 2 maps/images with density plot options  
next.

To run this, you need to install MatPlotLib <http://matplotlib.sourceforge.net/ 
 >, which requires Numpy <http://numpy.scipy.org/>. Both are  
installable as binary eggs via the Python easy_install package manager  
or from most Linux package managers. Of course you need Python too.

Enjoy
Michael
____________________
C. Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

Phone: 480-965-6262
Fax: 480-965-7671
www: <www.public.asu.edu/~cmbarton>



  
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