Thread: [Matplotlib-users] Histogram example doesn't run

Hi,

being a complete newbie, I tried to run the simple_plot example from the 
website with matplotlib-0.99.0. However, I get the error message:

--------------------------------------------------------------------
Traceback (most recent call last):
   File "simple_plot.py", line 5, in <module>
     plot(t, s, linewidth=1.0)
   File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 
2135, in plot
     ax = gca()
   File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 
582, in gca
     ax =  gcf().gca(**kwargs)
   File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 
276, in gcf
     return figure()
   File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 
254, in figure
     **kwargs)
   File 
"/usr/lib/python2.6/site-packages/matplotlib/backends/backend_gtkagg.py", 
line 44, in new_figure_manager
     return FigureManagerGTKAgg(canvas, num)
   File 
"/usr/lib/python2.6/site-packages/matplotlib/backends/backend_gtk.py", 
line 443, in __init__
     self.window.set_icon_from_file(window_icon)
glib.GError: Couldn't recognize the image file format for file 
'/usr/lib/python2.6/site-packages/matplotlib/mpl-data/images/matplotlib.svg'
--------------------------------------------------------------------

It works with 0.98.5.3. Is this a bug or could anything be wrong with my 
installation?

Regards,
Bernd

-- 
Bernd Eggink
http://sudrala.de

On Fri, Aug 7, 2009 at 4:10 AM, Bernd Eggink<mo...@su...> wrote:

> being a complete newbie, I tried to run the simple_plot example from the
> website with matplotlib-0.99.0. However, I get the error message:

> "/usr/lib/python2.6/site-packages/matplotlib/backends/backend_gtk.py",
> line 443, in __init__
>     self.window.set_icon_from_file(window_icon)
> glib.GError: Couldn't recognize the image file format for file
> '/usr/lib/python2.6/site-packages/matplotlib/mpl-data/images/matplotlib.svg'
> --------------------------------------------------------------------
>
> It works with 0.98.5.3. Is this a bug or could anything be wrong with my

Christoph, is GTKAgg the default backend in the win32 installers?  It
should be TkAgg.  Are you creating a setp.cfg when you build your
installer, as described at

  http://matplotlib.sourceforge.net/devel/release_guide.html#packaging

For OSX and the python2.5 win32 binary I build, I use a Makefile to
create setup.cfg so I don't forget :-)

Or Bernd, did you explicitly set backend gtk in your matplotlib rc file (
http://matplotlib.sourceforge.net/faq/troubleshooting_faq.html#matplotlib-directory-location).
 Which installer dd you run (exact file name if you still have it)?

Also, I recall that we patched gtk to use the png not the svg icon for
win32 -- Bernd, what does your sys.platform report::

  >> import sys
  >>> sys.platform
  'linux2'

 We check in backend_gtk

    if gtk.pygtk_version < (2, 8, 0) or sys.platform == 'win32':
        icon_filename = 'matplotlib.png'
    else:
        icon_filename = 'matplotlib.svg'

so you shouldn't be hitting this bug if your platform is win32.

JDH

John Hunter schrieb:
> On Fri, Aug 7, 2009 at 4:10 AM, Bernd Eggink<mo...@su...> wrote:
> 
>> being a complete newbie, I tried to run the simple_plot example from the
>> website with matplotlib-0.99.0. However, I get the error message:
> 
>> "/usr/lib/python2.6/site-packages/matplotlib/backends/backend_gtk.py",
>> line 443, in __init__
>>     self.window.set_icon_from_file(window_icon)
>> glib.GError: Couldn't recognize the image file format for file
>> '/usr/lib/python2.6/site-packages/matplotlib/mpl-data/images/matplotlib.svg'
>> --------------------------------------------------------------------
>>
>> It works with 0.98.5.3. Is this a bug or could anything be wrong with my
> 
> Christoph, is GTKAgg the default backend in the win32 installers?  It
> should be TkAgg.  Are you creating a setp.cfg when you build your
> installer, as described at
> 
>   http://matplotlib.sourceforge.net/devel/release_guide.html#packaging
> 
> For OSX and the python2.5 win32 binary I build, I use a Makefile to
> create setup.cfg so I don't forget :-)
> 
> Or Bernd, did you explicitly set backend gtk in your matplotlib rc file (
> http://matplotlib.sourceforge.net/faq/troubleshooting_faq.html#matplotlib-directory-location).

No. The stack trace shows that GTKAgg is used.

>  Which installer dd you run (exact file name if you still have it)?

I compiled matplotlib from the sources on a Crux system, simply saying

     python setup.py build
     python setup.py install --prefix=/usr --root=$PKG

> Also, I recall that we patched gtk to use the png not the svg icon for
> win32 -- Bernd, what does your sys.platform report::
> 
>   >> import sys
>   >>> sys.platform

Platform is 'linux2', and gtk.pygtk_version is (2, 14, 1).

To get it working, I replaced matplotlib.svg by a link to matplotlib.png 
(which is pretty ugly, though). Maybe the error should be catched and 
the .png image used as a fallback.

Regards,
Bernd

-- 
Bernd Eggink
http://sudrala.de

On Fri, Aug 7, 2009 at 7:47 AM, Bernd Eggink<mo...@su...> wrote:

>> Christoph, is GTKAgg the default backend in the win32 installers?  It
>> should be TkAgg.  Are you creating a setp.cfg when you build your
>> installer, as described at

Reminder to self: do not post before morning coffee.  For some reason
I thought you were on windows using on of Christoph's windows
installers.  Christoph, feel free to ignore this thread.

> Platform is 'linux2', and gtk.pygtk_version is (2, 14, 1).
>
> To get it working, I replaced matplotlib.svg by a link to matplotlib.png
> (which is pretty ugly, though). Maybe the error should be catched and
> the .png image used as a fallback.

Unfortunately, the exception glib.GError is gtk version dependent so I
can't easily catch it.  I am loathe to do a blanket except catch, but
I am not sure what the alternative is here.

JDH

On Fri, Aug 7, 2009 at 10:34 AM, John Hunter<jd...@gm...> wrote:

> Unfortunately, the exception glib.GError is gtk version dependent so I
> can't easily catch it.  I am loathe to do a blanket except catch, but
> I am not sure what the alternative is here.

I committed a change to the release branch (I did not try setting the
png if the svg failed, I just give up on the icon) -- if you could
test from the svn repo:


svn co https://matplotlib.svn.sf.net/svnroot/matplotlib/branches/v0_99_maint
mpl99

John Hunter schrieb:
> On Fri, Aug 7, 2009 at 10:34 AM, John Hunter<jd...@gm...> wrote:
> 
>> Unfortunately, the exception glib.GError is gtk version dependent so I
>> can't easily catch it.  I am loathe to do a blanket except catch, but
>> I am not sure what the alternative is here.
> 
> I committed a change to the release branch (I did not try setting the
> png if the svg failed, I just give up on the icon) -- if you could
> test from the svn repo:
> 
> 
> svn co https://matplotlib.svn.sf.net/svnroot/matplotlib/branches/v0_99_maint
> mpl99

It works now, but as expected I get no icon. Not sure if I don't like my 
hack better...

I suspect it has to do with my glib or gtk installation (both compiled 
from source). Maybe I'll ask the folks there.

Thanks anyway,
Bernd

-- 
Bernd Eggink
http://sudrala.de

monoped wrote:
> 
> Hi,
> 
> being a complete newbie, I tried to run the simple_plot example from the 
> website with matplotlib-0.99.0. However, I get the error message:
> 
> --------------------------------------------------------------------
> Traceback (most recent call last):
>    File "simple_plot.py", line 5, in <module>
>      plot(t, s, linewidth=1.0)
>    File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 
> 2135, in plot
>      ax = gca()
>    File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 
> 582, in gca
>      ax =  gcf().gca(**kwargs)
>    File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 
> 276, in gcf
>      return figure()
>    File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 
> 254, in figure
>      **kwargs)
>    File 
> "/usr/lib/python2.6/site-packages/matplotlib/backends/backend_gtkagg.py", 
> line 44, in new_figure_manager
>      return FigureManagerGTKAgg(canvas, num)
>    File 
> "/usr/lib/python2.6/site-packages/matplotlib/backends/backend_gtk.py", 
> line 443, in __init__
>      self.window.set_icon_from_file(window_icon)
> glib.GError: Couldn't recognize the image file format for file 
> '/usr/lib/python2.6/site-packages/matplotlib/mpl-data/images/matplotlib.svg'
> --------------------------------------------------------------------
> 
I had the same problem, and I fixed it by installing librsvg2-gtk (which
allows GTK to use SVG).  Hope this helps!
-- 
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