matplotlib-users Mailing List for matplotlib

Hi

I am new to matplotlib and I am trying to use it to draw a matrix. I
would want to give a different color to each box depending upon the
value this matrix element has


Could someone help me in quick start meanwhile I am looking into documentation.


Thanks


khem

What MPL version are you using, and what non-standard rc settings are you 
using? You must be using either usetex or ps.usedistiller, because 
ghostscript is failing to produce a distilled file. 

I just fixed a bug in the error report, please update from svn or change line 
1333 in backend_ps.py to read:

    if exit_status: raise RuntimeError('pdftops was not able to process your \
image.\nHere is the full report generated by pdftops: \n\n' + fh.read())


My experience has been that ghostscript fails like this when you are using the 
usetex option, and your latex syntax is incorrect. Latex may not exit with an 
error status, even though it encountered a problem, and the bad output is 
propagated downstream to dvips and ghostscript. If you want a more specific 
answer, please provide a specific example that produces your result. 

Darren


On Tuesday 17 October 2006 11:50, Humufr wrote:
> did you try to fix the size of the figure and the dpi?
>
> N.
>
> Eric Emsellem wrote:
> > Hi,
> >
> > I have a problem saving eps files in certain conditions. Unfortunately I
> > am unable to find a simple example which may be very illustrative here
> > to show you when it works and when it does not.
> > I include the error message below and so the question is: does anybody
> > have a hint of why the savefig fails and crashes?
> >
> > (I tried to close('all'), rcdefaults, etc).
> >
> > thanks for any input,
> >
> > Eric
> > =================
> >
> > >> savefig('toto.eps')
> >
> > Your figure is too big to fit on a4 paper. b4 paper will be used to
> > prevent clipping.
> > AFPL Ghostscript 8.51: Unrecoverable error, exit code 1
> > -------------------------------------------------------------------------
> >-- exceptions.NameError                                 Traceback (most
> > recent call last)
> >
> > /home/science/Sauron/AnalysisKin/Paper7/<ipython console>
> >
> > /usr/local/lib/python2.4/site-packages/matplotlib/pylab.py in
> > savefig(*args, **kwargs)
> >     809 def savefig(*args, **kwargs):
> >     810     fig = gcf()
> > --> 811     return fig.savefig(*args, **kwargs)
> >     812 if Figure.savefig.__doc__ is not None:
> >     813     savefig.__doc__ = _shift_string(Figure.savefig.__doc__)
> >
> > /usr/local/lib/python2.4/site-packages/matplotlib/figure.py in
> > savefig(self, *args, **kwargs)
> >     673                 kwargs[key] = rcParams['savefig.%s'%key]
> >     674
> > --> 675         self.canvas.print_figure(*args, **kwargs)
> >     676
> >     677     def colorbar(self, mappable, cax=None, **kw):
> >
> > /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_gtkagg
> >.py in print_figure(self, filename, dpi, facecolor, edgecolor,
> > orientation, **kwargs)
> >     112             try:
> >     113                 agg.print_figure(filename, dpi, facecolor,
> > edgecolor,
> > --> 114                                  orientation, **kwargs)
> >     115             except IOError, msg:
> >     116                 error_msg_gtk('Failed to save\nError message:
> > %s'%(msg,), self)
> >
> > /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py
> > in print_figure(self, filename, dpi, facecolor, edgecolor, orientation,
> > **kwargs)
> >     486                 ps = self.switch_backends(FigureCanvasPS)
> >     487                 ps.print_figure(filename, dpi, facecolor,
> > edgecolor, --> 488                                 orientation, **kwargs)
> >     489             elif ext.find('pdf')>=0:
> >     490                 from backend_pdf import FigureCanvasPdf
> >
> > /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py
> > in print_figure(self, outfile, dpi, facecolor, edgecolor, orientation,
> > papertype)
> >     999             # Let's keep the usetex stuff seperate from the
> > generic postscript
> >    1000             self._print_figure_tex(outfile, dpi, facecolor,
> > edgecolor,
> > -> 1001                                    orientation, papertype)
> >    1002         else:
> >    1003             if  isinstance(outfile, file):
> >
> > /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py
> > in _print_figure_tex(self, outfile, dpi, facecolor, edgecolor,
> > orientation, papertype)
> >    1233         elif rcParams['text.usetex']:
> >    1234             if False: pass # for debugging
> > -> 1235             else: gs_distill(tmpfile, ext=='.eps',
> > ptype=papertype, bbox=bbox)
> >    1236
> >    1237         if  isinstance(outfile, file):
> >
> > /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py
> > in gs_distill(tmpfile, eps, ptype, bbox)
> >    1331     exit_status = os.system(command)
> >    1332     fh = file(outfile)
> > -> 1333     if exit_status: raise RuntimeError('ghostscript was not able
> > to process \
> >    1334 your image.\nHere is the full report generated by ghostscript: \
> >    1335 \n\n'% dvifile + fh.read())
> >
> > NameError: global name 'dvifile' is not defined
> >
> >
> > --
> > ====================================================================
> > Eric Emsellem                             ems...@ob...
> >                            Centre de Recherche Astrophysique de Lyon
> > 9 av. Charles-Andre                        tel: +33 (0)4 78 86 83 84
> > 69561 Saint-Genis Laval Cedex              fax: +33 (0)4 78 86 83 86
> > France                    http://www-obs.univ-lyon1.fr/eric.emsellem
> > ====================================================================
> >
> > ------------------------------------------------------------------------
> >
> > -------------------------------------------------------------------------
> > Using Tomcat but need to do more? Need to support web services, security?
> > Get stuff done quickly with pre-integrated technology to make your job
> > easier Download IBM WebSphere Application Server v.1.0.1 based on Apache
> > Geronimo
> > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Matplotlib-users mailing list
> > Mat...@li...
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job
> easier Download IBM WebSphere Application Server v.1.0.1 based on Apache
> Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

-- 
Darren S. Dale, Ph.D.
Staff Scientist
Cornell High Energy Synchrotron Source
Cornell University
275 Wilson Lab
Rt. 366 & Pine Tree Road
Ithaca, NY 14853

dd...@co...
office: (607) 255-3819
fax: (607) 255-9001
http://www.chess.cornell.edu

On Tuesday 17 October 2006 11:50, Humufr wrote:
> did you try to fix the size of the figure and the dpi?

Just wondering: you wouldn't happen to plot a space character by itself, by 
any chance ? I remmbr running into something similar (the dvifile not being 
processed properly), and it turned out that I was trying to use r' ' for a 
legend. Substituting it with '' (viz, empty character) did the trick. 

My 2c would be to try plotting first with usetex=False, then add with 
usetex=True but text group by text group (tick labels, legened) till you find 
the culprit.

did you try to fix the size of the figure and the dpi?

N.

Eric Emsellem wrote:
> Hi,
>
> I have a problem saving eps files in certain conditions. Unfortunately I
> am unable to find a simple example which may be very illustrative here
> to show you when it works and when it does not.
> I include the error message below and so the question is: does anybody
> have a hint of why the savefig fails and crashes?
>
> (I tried to close('all'), rcdefaults, etc).
>
> thanks for any input,
>
> Eric
> =================
>
> >> savefig('toto.eps')
>   
>
> Your figure is too big to fit on a4 paper. b4 paper will be used to
> prevent clipping.
> AFPL Ghostscript 8.51: Unrecoverable error, exit code 1
> ---------------------------------------------------------------------------
> exceptions.NameError                                 Traceback (most
> recent call last)
>
> /home/science/Sauron/AnalysisKin/Paper7/<ipython console>
>
> /usr/local/lib/python2.4/site-packages/matplotlib/pylab.py in
> savefig(*args, **kwargs)
>     809 def savefig(*args, **kwargs):
>     810     fig = gcf()
> --> 811     return fig.savefig(*args, **kwargs)
>     812 if Figure.savefig.__doc__ is not None:
>     813     savefig.__doc__ = _shift_string(Figure.savefig.__doc__)
>
> /usr/local/lib/python2.4/site-packages/matplotlib/figure.py in
> savefig(self, *args, **kwargs)
>     673                 kwargs[key] = rcParams['savefig.%s'%key]
>     674
> --> 675         self.canvas.print_figure(*args, **kwargs)
>     676
>     677     def colorbar(self, mappable, cax=None, **kw):
>
> /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_gtkagg.py
> in print_figure(self, filename, dpi, facecolor, edgecolor, orientation,
> **kwargs)
>     112             try:
>     113                 agg.print_figure(filename, dpi, facecolor,
> edgecolor,
> --> 114                                  orientation, **kwargs)
>     115             except IOError, msg:
>     116                 error_msg_gtk('Failed to save\nError message:
> %s'%(msg,), self)
>
> /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py
> in print_figure(self, filename, dpi, facecolor, edgecolor, orientation,
> **kwargs)
>     486                 ps = self.switch_backends(FigureCanvasPS)
>     487                 ps.print_figure(filename, dpi, facecolor, edgecolor,
> --> 488                                 orientation, **kwargs)
>     489             elif ext.find('pdf')>=0:
>     490                 from backend_pdf import FigureCanvasPdf
>
> /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py
> in print_figure(self, outfile, dpi, facecolor, edgecolor, orientation,
> papertype)
>     999             # Let's keep the usetex stuff seperate from the
> generic postscript
>    1000             self._print_figure_tex(outfile, dpi, facecolor,
> edgecolor,
> -> 1001                                    orientation, papertype)
>    1002         else:
>    1003             if  isinstance(outfile, file):
>
> /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py
> in _print_figure_tex(self, outfile, dpi, facecolor, edgecolor,
> orientation, papertype)
>    1233         elif rcParams['text.usetex']:
>    1234             if False: pass # for debugging
> -> 1235             else: gs_distill(tmpfile, ext=='.eps',
> ptype=papertype, bbox=bbox)
>    1236
>    1237         if  isinstance(outfile, file):
>
> /usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py
> in gs_distill(tmpfile, eps, ptype, bbox)
>    1331     exit_status = os.system(command)
>    1332     fh = file(outfile)
> -> 1333     if exit_status: raise RuntimeError('ghostscript was not able
> to process \
>    1334 your image.\nHere is the full report generated by ghostscript: \
>    1335 \n\n'% dvifile + fh.read())
>
> NameError: global name 'dvifile' is not defined
>
>   
> -- 
> ====================================================================
> Eric Emsellem                             ems...@ob...
>                            Centre de Recherche Astrophysique de Lyon
> 9 av. Charles-Andre                        tel: +33 (0)4 78 86 83 84
> 69561 Saint-Genis Laval Cedex              fax: +33 (0)4 78 86 83 86
> France                    http://www-obs.univ-lyon1.fr/eric.emsellem
> ====================================================================
>   
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> ------------------------------------------------------------------------
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>   

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<pre wrap="">Hi,

I have a problem saving eps files in certain conditions. Unfortunately I
am unable to find a simple example which may be very illustrative here
to show you when it works and when it does not.
I include the error message below and so the question is: does anybody
have a hint of why the savefig fails and crashes?

(I tried to close('all'), rcdefaults, etc).

thanks for any input,

Eric
=================<span class="moz-txt-citetags">

&gt;&gt; </span>savefig('toto.eps')
</pre>
<pre wrap=""><!---->
Your figure is too big to fit on a4 paper. b4 paper will be used to
prevent clipping.
AFPL Ghostscript 8.51: Unrecoverable error, exit code 1
---------------------------------------------------------------------------
exceptions.NameError                                 Traceback (most
recent call last)

/home/science/Sauron/AnalysisKin/Paper7/&lt;ipython console&gt;

/usr/local/lib/python2.4/site-packages/matplotlib/pylab.py in
savefig(*args, **kwargs)
    809 def savefig(*args, **kwargs):
    810     fig = gcf()
--&gt; 811     return fig.savefig(*args, **kwargs)
    812 if Figure.savefig.__doc__ is not None:
    813     savefig.__doc__ = _shift_string(Figure.savefig.__doc__)

/usr/local/lib/python2.4/site-packages/matplotlib/figure.py in
savefig(self, *args, **kwargs)
    673                 kwargs[key] = rcParams['savefig.%s'%key]
    674
--&gt; 675         self.canvas.print_figure(*args, **kwargs)
    676
    677     def colorbar(self, mappable, cax=None, **kw):

/usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_gtkagg.py
in print_figure(self, filename, dpi, facecolor, edgecolor, orientation,
**kwargs)
    112             try:
    113                 agg.print_figure(filename, dpi, facecolor,
edgecolor,
--&gt; 114                                  orientation, **kwargs)
    115             except IOError, msg:
    116                 error_msg_gtk('Failed to save\nError message:
%s'%(msg,), self)

/usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py
in print_figure(self, filename, dpi, facecolor, edgecolor, orientation,
**kwargs)
    486                 ps = self.switch_backends(FigureCanvasPS)
    487                 ps.print_figure(filename, dpi, facecolor, edgecolor,
--&gt; 488                                 orientation, **kwargs)
    489             elif ext.find('pdf')&gt;=0:
    490                 from backend_pdf import FigureCanvasPdf

/usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py
in print_figure(self, outfile, dpi, facecolor, edgecolor, orientation,
papertype)
    999             # Let's keep the usetex stuff seperate from the
generic postscript
   1000             self._print_figure_tex(outfile, dpi, facecolor,
edgecolor,
-&gt; 1001                                    orientation, papertype)
   1002         else:
   1003             if  isinstance(outfile, file):

/usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py
in _print_figure_tex(self, outfile, dpi, facecolor, edgecolor,
orientation, papertype)
   1233         elif rcParams['text.usetex']:
   1234             if False: pass # for debugging
-&gt; 1235             else: gs_distill(tmpfile, ext=='.eps',
ptype=papertype, bbox=bbox)
   1236
   1237         if  isinstance(outfile, file):

/usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py
in gs_distill(tmpfile, eps, ptype, bbox)
   1331     exit_status = os.system(command)
   1332     fh = file(outfile)
-&gt; 1333     if exit_status: raise RuntimeError('ghostscript was not able
to process \
   1334 your image.\nHere is the full report generated by ghostscript: \
   1335 \n\n'% dvifile + fh.read())

NameError: global name 'dvifile' is not defined

</pre>
<pre class="moz-signature" cols="72">-- 
====================================================================
Eric Emsellem                             <a class="moz-txt-link-abbreviated" href="mailto:ems...@ob...">ems...@ob...</a>
                           Centre de Recherche Astrophysique de Lyon
9 av. Charles-Andre                        tel: +33 (0)4 78 86 83 84
69561 Saint-Genis Laval Cedex              fax: +33 (0)4 78 86 83 86
France                    <a class="moz-txt-link-freetext" href="http://www-obs.univ-lyon1.fr/eric.emsellem">http://www-obs.univ-lyon1.fr/eric.emsellem</a>
====================================================================
</pre>
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