I meant to send this to the list yesterday, but I just noticed I sent it
only to Ben. For completeness, here it is...
---------- Forwarded message ----------
From: Warren Weckesser <warren.weckes...@enthought.com>
Date: Sat, Nov 12, 2011 at 8:45 PM
Subject: Re: [Matplotlib-users] Upgraded to 1.1.0, now only line graphs
work!
To: Benjamin Root <ben.r...@ou.edu>
On Sat, Nov 12, 2011 at 8:03 PM, Benjamin Root <ben.r...@ou.edu> wrote:
>
>
> 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?
>
>
The version of numpy in Ubuntu 10.10 is 1.3, but the 'nextafter' function
was added to numpy in version 1.4.
This page:
http://matplotlib.sourceforge.net/users/installing.html
says "matplotlib requires numpy version 1.1 or later", so either that page
is incorrect, or a newer feature of numpy has been used in the matplotlib
code unintentionally.
Warren
Ben Root
>
>
>
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