Holcombe:PythonDataAnalysis
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SciPy includes matplotlib (ref)
(Not necessary: after downloading SciPy I updated to the more recent version of matplotlib using matplotlib-0.98.5.2-py2.5-mpkg.zip for OSX, which installs in /Library/Python/2.5/site-packages/ and I needed to add that directory to my PYTHONPATH in my .profile file in my home directory)
See the HowTo and Cookbook, double-axis plotting
loadtxt returns recarray, like minispreadsheet explanation
angs=(0,90,180,270)
anglabels=('Right','Upper','Left','Lower')
setp(gca(),'xticks',angs)
setp(gca(),'xticklabels',anglabels)