After some time spent on other matters, and because I am on medical rest, I am going to start a series of short tutorials about matplotlib.

The first thing you need is to have matplotlib installed. As root:

aptitude install python-matplotlib python-matplotlib-data python-matplotlib-doc

Then run python from the command line

ernesto@zvezda:~/bin$ python2.5
Python 2.5.4 (r254:67916, Feb 17 2009, 20:16:45)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.

>>> import matplotlib.pyplot as plt
>>> plt.plot([1,2,3],[5,7,9])
[]
>>> plt.ylabel('Eje Y')

>>> plt.xlabel('Eje X')
>>> plt.show()

The first command imports the matplotlib library, then the points to plot are passed in, those for the X axis and for the Y axis; then labels are set on the Cartesian axes and the plot is displayed.

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