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Matplotlib is required for many functions and examples in PyCA. The matplotlib library can use one of several 'backends' for displaying plot windows, one of which must be installed. The default backend can be set using the matplotlibrc file, see the details here. The short solution is to add/modify the following line in ~/.matplotlib/matplotlibrc
(or create the file if it doesn't exist)
backend : WX
See IPython Notes for information on matplotlib and IPython.
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