余亮罡, on 2011-01-03 13:31,  wrote:
> I just do not know how to change the font size,could you tell
> me that? Thank you !

Here's a small example. You can either keep around the ylabel
from when you first create it:

  import matplotlib.pyplot as plt
  lbl = plt.ylabel("foo")
  lbl.set_size(25)

If you already have the labels on an axes:

  ax = plt.gca()
  lbl = ax.yaxis.get_label()
  lbl.set_size('x-small')

Note that ax.get_ylabel() only gets you the string of the
label, which is why you have to use ax.yaxis.get_label() to get
an instance of the matplotlib.text.Text object in order to change
its size.
 
hope that helps,
-- 
Paul Ivanov
314 address only used for lists,  off-list direct email at:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7 

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