Matplotlib plots not showing up in Mac OSX?

Question

I am running Mac OSX 10.5.8. I installed matplotlib using macports. I get some examples from the matplotlib gallery like this one, without modification:

http://matplotlib.sourceforge.net/examples/api/unicode_minus.html

I run it, get no error, but the picture does not show up. In Linux Ubuntu I get it.

Do you know what could be wrong here?

Answer 1

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

Answer 2

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()))