Matplotlib plots not showing up in Mac OSX?

I can verify this on my end as well. To fix, here's what I did

sudo port install py25-matplotlib +cairo+gtk2
sudo port install py26-matplotlib +cairo+gtk2

Also, we need to change the default backend to a GUI based one.

Edit the file ~/.matplotlib/matplotlibrc, and add:

backend: GTKCairo

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Also, you can try the following, which may allow you to not need the GTK or Cairo backends. Edit ~/.matplotlib/matplotlibrc and add:

backend: MacOSX

With the port with those variants installed, this works as well, but it doesn't require X11.

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By the way, the error that I saw was the following:

/opt/local/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/backends/__init__.py:41: UserWarning: 
Your currently selected backend, 'Agg' does not support show().
Please select a GUI backend in your matplotlibrc file ('/Users/wlynch/.matplotlib/matplotlibrc') or with matplotlib.use()
(backend, matplotlib.matplotlib_fname()))

I had the same problem, even I could see how a new application window was created and immediately disappeared.

Simple solution - just check if you have

# Assumes you have imported "matplotlib.pyplot" as "plt"
plt.show()

after the plot

This is what worked for me. I just changed the import of Matplotlib

import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt