# xkcd and matplotlib

Hi guys. Attempting to use the xkcd graphics feature that has been recently added to matplotlib from within sagemath.

import matplotlib.pyplot

matplotlib.pyplot.xkcd()

plot(sin(x),(x,-pi,pi),ticks=pi/4,tick_formatter=pi)

Matplotlib throws the following warning:

*/home/joal/bin/sage-6.2/local/lib/python2.7/site-packages/matplotlib-1.3\
.1-py2.7-linux-x86_64.egg/matplotlib/font_manager.py:1236: UserWarning:
findfont: Font family ['Humor Sans', 'Comic Sans MS'] not found. Falling
back to Bitstream Vera Sans
(prop.get_family(), self.defaultFamily[fontext])) *

I have installed Humor Sans.ttf onto the main system, and into the directory:

*/home/joal/bin/sage-6.2/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/mpl-data/fonts/*

... but don't know how to reset the matplotlib font cache so matplotlib will pay attention to the new font.

[EDIT]

Okay, seem to have part of the solution - need to verify on a Linux machine this weekend.

EDIT of EDIT

The tricks below don't work on LinuxMint.

The font is recognised in the virtualbox image if it is dumped into:

*sage-6.2/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/mpl-data/fonts/*

and renamed *Humor-Sans.ttf*

Then you need to create a .matplotlib folder in the user directory.

*mkdir ~/.matplotlib*

The concern is that it now that Humor Sans is used for text font, but not for the numbers on the horizontal and vertical axes. Any suggestions, sagers?

[EDIT]

Which turns out to be a consequence of using the pi tick_formatter.