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I'm having some problems understanding the difference between pylab.xticks()
and pylab.yticks()
Consider the following:
> import pylab as P
> import numpy as N
>
> data = N.random.random((10, 10))
> P.matshow(data)
> P.xticks([0, 1, 2], ['1', '2', '3'])
> P.show()
Why does this work, but if I change P.xticks to P.yticks, it doesn't?
The error message that I get back doesn't give me any insight as to what
could cause the difference between xticks and yticks.
 File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/figure.py",
line 612, in draw
 for a in self.axes: a.draw(renderer)
 File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/axes.py",
line 1287, in draw
 self.transData.freeze() # eval the lazy objects
ValueError: Domain error on eval_scalars in Transformation::freeze
 matplotlib.__version__
Out[2]: '0.90.1'
I am still in the learning phase, so any insight as to what's going on is
appreciated.
Best,
 Jan

Dear all,
thanks for your help. this is what I was looking for!
Dirk
2007年9月26日, Eric Firing <ef...@ha...>:
>
> David Huard wrote:
> > Hi Dirk,
> >
> > If you haven't already done so, look at the numpy.ma <http://numpy.ma/>
> > module. It provides a masked array object that deals gracefully with
> > missing values. To the best of my knowledge, most matplotlib functions
> > understand masked arrays and deal with it accordingly, exception made of
> > those requiring a full matrix (such as contour). Take a look at
>
> contour handles masked arrays correctly, as far as I know; contourf has
> some bugs in its masked array handling, but depending on the type and
> distribution of voids, it may still be good enough.
>
> pcolor and image have no problems with masked arrays.
>
> Eric
>
> > examples/image_masked.py. Also, in the Basemap toolkit, there is at
> > least one example showing how to plot a masked array on a map.
> >
> > Cheers,
> >
> > David
>
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Hello.
I've been having trouble getting Unicode characters to render. I just
get a box in the title of my figure, rather than the character I need.
Here is my code:
#!/usr/bin/env python
from pylab import *
plot([1,2,3,4])
title(u"\u0251")
savefig("test.eps")
savefig("test.png")
show()
That character is LATIN SMALL LETTER ALPHA. It's used in the
International Phonetic Alphabet.
I'm on Linux and I'm using matplotlib 0.90.1-2 (debian package
version). I have a few TTF fonts in my system that contain that
glyph. One is 'Arial Unicode MS', which I copied from my windows
machine.
As you can see, I will need to generate an EPS that renders the
character... That EPS file will be imported into MS Word on a Windows
PC and printed.
I will happily use any solution that allows me to use that character
in the final product... :) It doesn't have to be unicode..
I believe that my fonts are configured correctly on this Linux
system--I can use the Arial Unicode MS font in Open Office. However,
I'm not sure that MPL is finding them.
When I point the TTFPATH environment variable a directory that only
contains ARIALUNI.TTF, I get gibberish for all characters in my
figure.
When I use ~/.matplotlib/matplotlibrc to list Arial Unicode MS as the
only font in the san-serif family, I don't observe any change in the
text in the figure.
...I did successfully instantiate an FT2FONT object out of my
ARIALUNI.TTF file, but, I didn't know what to do with it at that
point.
Help?
Cheers,
--Dave Loyall
Omaha, Nebraska, USA