On Saturday, November 12, 2011, John Ladasky <john_lada...@sbcglobal.net>
wrote:
> Two days ago I posted some questions about upgrading, and was pointed to
> the right resources by some readers who replied to me privately
> (thanks!). I am running Python 2.6 on an Ubuntu Linux 10.10 platform.
> The upgrade appeared to build successfully, but I still have problems.
>
> Line graphs appear to be working all right, but images and contour
> graphs generate errors, and fail to draw.
>
>
> My procedure:
>
> I deleted every last old matplotlib-related file from my hard disk,from
> both my Python dist-packages directory and from my home directory. I
> got my build dependencies up to date, and installed using git as
> described here:
>
> http://matplotlib.sourceforge.net/faq/installing_faq.html#install-from-git
>
>
> The three-line simple_plot.py script suggested here...
>
> http://matplotlib.sourceforge.net/faq/installing_faq.html
>
> ...runs, displays a line graph, and outputs the following when run with
> the flag --verbose-helpful:
>
> 17:26:42 -> python simple_plot.py --verbose-helpful
> $HOME=/home/john
> CONFIGDIR=/home/john/.matplotlib
> matplotlib data
> path /usr/local/lib/python2.6/dist-packages/matplotlib/mpl-data
> loaded rc
> file
/usr/local/lib/python2.6/dist-packages/matplotlib/mpl-data/matplotlibrc
> matplotlib version 1.2.x
> verbose.level helpful
> interactive is False
> platform is linux2
> Using fontManager instance from /home/john/.matplotlib/fontList.cache
> backend GTKAgg version 2.21.0
> findfont:
> Matching
:family=sans-serif:style=normal:variant=normal:weight=normal:stretch=normal:size=medium
to Bitstream Vera Sans
(/usr/local/lib/python2.6/dist-packages/matplotlib/mpl-data/fonts/ttf/Vera.ttf)
with score of 0.000000
>
>
> Now, here's a very simple script of mine, which should draw a figure
> with a colored bulls-eye:
>
> from numpy import exp, fromfunction, hypot
> import matplotlib.pyplot as plt
>
> def func(x, y):
> return exp(-hypot(x-50,y-50) / 20)
>
> fig = plt.figure()
> ax = plt.subplot(111)
> arr = fromfunction(func, (101,101))
> img = plt.imshow(arr)
> plt.show()
>
>
> Instead, it draws an empty figure, and returns a long and
> apparently-repeated traceback, which I hesitate to post in its entirety.
> Here's the last repeat. I believe that I got this eight times in a row:
>
> Traceback (most recent call last):
> File
>
"/usr/local/lib/python2.6/dist-packages/matplotlib/backends/backend_gtk.py",
line 418, in expose_event
> self._render_figure(self._pixmap, w, h)
> File
>
"/usr/local/lib/python2.6/dist-packages/matplotlib/backends/backend_gtkagg.py",
line 75, in _render_figure
> FigureCanvasAgg.draw(self)
> File
>
"/usr/local/lib/python2.6/dist-packages/matplotlib/backends/backend_agg.py",
line 400, in draw
> self.figure.draw(self.renderer)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/artist.py",
> line 55, in draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/figure.py",
> line 886, in draw
> func(*args)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/artist.py",
> line 55, in draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/axes.py", line
> 1983, in draw
> a.draw(renderer)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/artist.py",
> line 55, in draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/image.py",
> line 356, in draw
> im = self.make_image(renderer.get_image_magnification())
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/image.py",
> line 576, in make_image
> transformed_viewLim)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/image.py",
> line 202, in _get_unsampled_image
> x = self.to_rgba(self._A, bytes=True)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/cm.py", line
> 215, in to_rgba
> x = self.cmap(x, alpha=alpha, bytes=bytes)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/colors.py",
> line 521, in __call__
> cbook._putmask(xa, xa==1.0, np.nextafter(xa.dtype.type(1),
> AttributeError: 'module' object has no attribute 'nextafter'
>
>
> Programs which invoke contour() instead of imshow() fail similarly. I
> downloaded the 1.1.0 animation examples (my whole reason for upgrading
> was to use the new animation methods), and only the line-graph examples
> work.
>
>
> As suggested (on a page I can't quite track down now), I captured a log
> of the build and install commands. The words "error" or "warning" do
> not show up in either of those logs -- and I did get several warnings
> when building 0.99 and 1.0.1, so I feel like things ought to be working
> better this time, not worse...
>
> Thanks for any hints!
>
>
Looks like mpl truly can't be used with older version of numpy. Which
version are you using?
Ben Root
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