[Matplotlib-users] show() command does not create plot with agg, only with wx

Hello,

The only backend which works on my machine is wx.
The problem I was having was that matplotlib installed fine, but didn't show
plots. I tried removing matplotlib and re-installing,
that didn't help. I was using the Agg backend and figure windows did not get
created. Cairo doesn't work either.
I can live with only using wx, but

On my machine, I test with the following script:
from pylab import *
ion()
fig = figure()
plot([1,2,3])
show()
fig.savefig('test.png')

With agg, the figure saves correctly, but no window appears. With wx, a
window with the plot appears.  I'm running numpy 1.5.0 (also built from
source).

OS: Ubuntu 10.04
uname output: Linux 2.6.32-25-generic-pae #44-Ubuntu SMP
matplotlib version: 1.0.0
verbose output of script above:
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 1.0.0
verbose.level helpful
interactive is False
units is False
platform is linux2
Using fontManager instance from .matplotlib/fontList.cache
backend agg version v2.2

basedirlist is: ['/usr/local', '/usr']
============================================================================
BUILDING MATPLOTLIB
            matplotlib: 1.0.0
                python: 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)  [GCC
                        4.4.3]
              platform: linux2

REQUIRED DEPENDENCIES
                 numpy: 1.5.0
             freetype2: 9.22.3

OPTIONAL BACKEND DEPENDENCIES
                libpng: 1.2.42
               Tkinter: no
                        * Using default library and include directories for
                        * Tcl and Tk because a Tk window failed to open.
                        * You may need to define DISPLAY for Tk to work so
                        * that setup can determine where your libraries are
                        * located. Tkinter present, but header files are not
                        * found. You may need to install development
                        * packages.
              wxPython: 2.8.10.1
                        * WxAgg extension not required for wxPython >= 2.8
            pkg-config: looking for pygtk-2.0 gtk+-2.0
                        * Package pygtk-2.0 was not found in the pkg-config
                        * search path. Perhaps you should add the directory
                        * containing `pygtk-2.0.pc' to the PKG_CONFIG_PATH
                        * environment variable No package 'pygtk-2.0' found
                        * You may need to install 'dev' package(s) to
                        * provide header files.
                  Gtk+: no
                        * Could not find Gtk+ headers in any of
                        * '/usr/local/include', '/usr/include', '.'
       Mac OS X native: no
                    Qt: no
                   Qt4: Qt: 4.6.2, PyQt4: 4.7.2
                 Cairo: 1.8.8

OPTIONAL DATE/TIMEZONE DEPENDENCIES
              datetime: present, version unknown
              dateutil: 1.4.1
                  pytz: 2010b

OPTIONAL USETEX DEPENDENCIES
                dvipng: no
           ghostscript: 8.71
                 latex: no
               pdftops: 0.12.4

[Edit setup.cfg to suppress the above messages]
============================================================================
pymods ['pylab']
packages ['matplotlib', 'matplotlib.backends',
'matplotlib.backends.qt4_editor', 'matplotlib.projections',
'matplotlib.testing', 'matplotlib.testing.jpl_units', 'matplotlib.tests',
'mpl_toolkits', 'mpl_toolkits.mplot3d', 'mpl_toolkits.axes_grid',
'mpl_toolkits.axes_grid1', 'mpl_toolkits.axisartist',
'matplotlib.sphinxext', 'matplotlib.numerix', 'matplotlib.numerix.mlab', '
matplotlib.numerix.ma', 'matplotlib.numerix.linear_algebra',
'matplotlib.numerix.random_array', 'matplotlib.numerix.fft',
'matplotlib.tri', 'matplotlib.delaunay']
running build
running build_py
copying lib/matplotlib/mpl-data/matplotlibrc ->
build/lib.linux-i686-2.6/matplotlib/mpl-data
copying lib/matplotlib/mpl-data/matplotlib.conf ->
build/lib.linux-i686-2.6/matplotlib/mpl-data
running build_ext

-Jacob