matplotlib-users

[Matplotlib-users] latex labels on saved plots

[Jordan A. <jc...@co...>]

Hello,

    I'm having trouble saving eps or pdf versions of plots that have TeX 
labels using matplotlib.  When I try to save an EPS file, I get the message:

...
RuntimeError: ghostscript was not able to process your image.
Here is the full report generated by ghostscript:

(Author's note: No 'report' is actually printed)

    When I try to save a PDF file, I get the message:

...
  File 
"C:\Python24\Lib\site-packages\matplotlib\backends\backend_pdf.py", line 
1085, in get_canvas_
width_height
    return d*self.file.width, d*self.file.height
AttributeError: PdfFile instance has no attribute 'width'

    Does anyone have any suggestions for how to fix this?  The TeX 
labels work fine is I save as a PNG file.  I saw an older thread 
(http://www.mail-archive.com/mat...@li.../msg03953.html 
) that seems to address similar issues, but I don't understand the 
solution (using XPDF distiller).

Thank you for your help,

--Jordan

Re: [Matplotlib-users] latex labels on saved plots

[<jk...@ik...>]

Jordan Atlas <jc...@co...> writes:

> I'm having trouble saving eps or pdf versions of plots that have
> TeX labels using matplotlib.

Which version of matplotlib are you using? The error message you quote
for the pdf backend shows a line 1085 in get_canvas_width_height, which
is impossible both in the latest released version 0.90.1 and in current
svn. I vaguely remember there being a bug like that quite some time ago.

In any case, no released version of matplotlib supports using TeX with
the pdf backend. Do you mean the (TeX-like) mathtext format parsed by
matplotlib? In current svn there is some support for TeX with the pdf
backend, but it has not (AFAIK) been tested on Windows.

> I saw an older thread 
> (http://www.mail-archive.com/mat...@li.../msg03953.html 
> ) that seems to address similar issues, but I don't understand the 
> solution (using XPDF distiller).

Gmane mangles the URL (to protect email addresses) so I can't read the
message you cite, but using the XPDF distiller means setting
ps.usedistiller to xpdf in your matplotlibrc file. You will need to have
ps2pdf (from ghostscript) and pdftops (from xpdf or poppler) installed.

-- 
Jouni K. Seppänen
http://www.iki.fi/jks

Re: [Matplotlib-users] latex labels on saved plots

[Jordan A. <jc...@co...>]

Jouni,

>Which version of matplotlib are you using? The error message you quote
>for the pdf backend shows a line 1085 in get_canvas_width_height, which
>is impossible both in the latest released version 0.90.1 and in current
>svn. I vaguely remember there being a bug like that quite some time ago.
>
>  
>
I apologize for the missing information.  I was using matplotlib 0.90.0 
with python 2.4, and just upgraded to matplotlib 0.90.1 after reading 
your message.  Also, I'm doing this all on winXP.

Now, when I try to save a PDF (with the newer version of matplotlib), I 
get the error:

  File "C:\Python24\Lib\site-packages\matplotlib\pylab.py", line 796, in 
savefig
    return fig.savefig(*args, **kwargs)
  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 759, 
in savefig
    self.canvas.print_figure(*args, **kwargs)
  File 
"C:\Python24\Lib\site-packages\matplotlib\backends\backend_tkagg.py", 
line 187, in print_figu
re
    agg.print_figure(filename, dpi, facecolor, edgecolor, orientation,
  File 
"C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py", line 
497, in print_figure

    printfunc(filename, dpi, facecolor, edgecolor, orientation, **kwargs)
  File 
"C:\Python24\Lib\site-packages\matplotlib\backends\backend_pdf.py", line 
1393, in print_figur
e
    self.figure.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 601, 
in draw
    for a in self.axes: a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 1286, in 
draw
    a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axis.py", line 601, in draw
    tick.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axis.py", line 176, in draw
    if self.label1On: self.label1.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 911, in draw
    Text.draw(self, renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 420, in draw
    self._fontproperties, angle)
  File "C:\Python24\Lib\site-packages\matplotlib\backend_bases.py", line 
383, in draw_tex
    raise NotImplementedError
NotImplementedError

I get the same error as in my original post when trying to save an EPS:

  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 759, 
in savefig
    self.canvas.print_figure(*args, **kwargs)
  File 
"C:\Python24\Lib\site-packages\matplotlib\backends\backend_tkagg.py", 
line 187, in print_figu
re
    agg.print_figure(filename, dpi, facecolor, edgecolor, orientation,
  File 
"C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py", line 
497, in print_figure

    printfunc(filename, dpi, facecolor, edgecolor, orientation, **kwargs)
  File 
"C:\Python24\Lib\site-packages\matplotlib\backends\backend_ps.py", line 
1011, in print_figure

    orientation, papertype)
  File 
"C:\Python24\Lib\site-packages\matplotlib\backends\backend_ps.py", line 
1247, in _print_figur
e_tex
    else: gs_distill(tmpfile, ext=='.eps', ptype=papertype, bbox=bbox)
  File 
"C:\Python24\Lib\site-packages\matplotlib\backends\backend_ps.py", line 
1366, in gs_distill
    if exit_status: raise RuntimeError('ghostscript was not able to 
process \
RuntimeError: ghostscript was not able to process your image.
Here is the full report generated by ghostscript:


>In any case, no released version of matplotlib supports using TeX with
>the pdf backend. Do you mean the (TeX-like) mathtext format parsed by
>matplotlib? In current svn there is some support for TeX with the pdf
>backend, but it has not (AFAIK) been tested on Windows.
>  
>
I guess I mean TeX-like mathtext format parsed by matplotlib.  For 
example, I'm using things like this:

rc('text', usetex=True) 
Plotting.xlabel(r'\textbf{Time (s)}', fontsize=16)

>Gmane mangles the URL (to protect email addresses) so I can't read the
>message you cite, but using the XPDF distiller means setting
>ps.usedistiller to xpdf in your matplotlibrc file. You will need to have
>ps2pdf (from ghostscript) and pdftops (from xpdf or poppler) installed.
>
>  
>

I will look into this immediately.

Thank you,

--Jordan

Re: [Matplotlib-users] latex labels on saved plots

[<jk...@ik...>]

Jordan Atlas <jc...@co...> writes:

> Now, when I try to save a PDF (with the newer version of matplotlib), I 
> get the error:
 [...]
>   File "C:\Python24\Lib\site-packages\matplotlib\backend_bases.py", line 
> 383, in draw_tex
>     raise NotImplementedError
> NotImplementedError

That means you are trying to call TeX, which is not supported by that
version of the pdf backend.

> I get the same error as in my original post when trying to save an EPS:
 [...]
> RuntimeError: ghostscript was not able to process your image.
> Here is the full report generated by ghostscript:

Do you have ghostscript installed? If you set verbose.level to debug or
debug-annoying, what do you get?

>>Do you mean the (TeX-like) mathtext format parsed by
>>matplotlib? 
>>
> I guess I mean TeX-like mathtext format parsed by matplotlib.  For 
> example, I'm using things like this:
>
> rc('text', usetex=True) 
> Plotting.xlabel(r'\textbf{Time (s)}', fontsize=16)

usetex=True means that you are trying to use an external TeX program.

-- 
Jouni K. Seppänen
http://www.iki.fi/jks

Re: [Matplotlib-users] latex labels on saved plots

[Jordan A. <jc...@co...>]

>Do you have ghostscript installed? If you set verbose.level to debug or
>debug-annoying, what do you get?
>
>  
>

I realized that the ghostscript path wasn't set up properly, so that was 
what was causing part of the problem with EPS files.  It works sometimes 
now (sometimes the EPS is just a blank file, even though the plot shows 
up properly when I do pylab.show().  I'm still trying to narrow down 
what ameks the difference here).

>>I guess I mean TeX-like mathtext format parsed by matplotlib.  For 
>>example, I'm using things like this:
>>
>>rc('text', usetex=True) 
>>Plotting.xlabel(r'\textbf{Time (s)}', fontsize=16)
>>    
>>
>
>usetex=True means that you are trying to use an external TeX program.
>
>  
>

Ok, so am I to understand that usetex=True is not supported for PDF/EPS 
output?  Can you explain what the "Tex-like mathtext format parsed by 
matplotlib" is?

Thank you for your assistance,

--Jordan

Re: [Matplotlib-users] latex labels on saved plots

[Michael D. <md...@st...>]

Jordan Atlas wrote:
> Ok, so am I to understand that usetex=True is not supported for PDF/EPS 
> output?

In 0.90.1, it is not supported in PDF.

>  Can you explain what the "Tex-like mathtext format parsed by 
> matplotlib" is?

matplotlib also has a built-in math formatting engine that does not use 
TeX itself.  You can use it by leaving "usetex=False" (the default) and 
putting a '$' at the beginning and end of your TeX strings.

   Plotting.xlabel(r'$\alpha^2$')

Unfortunately, the built-in engine only supports a subset of what TeX 
can do.  That subset is much smaller in 0.90.1 than in the current SVN, 
where much progress has recently been made.

See here for information pertaining to version 0.90.1:

   http://matplotlib.sourceforge.net/matplotlib.mathtext.html

Cheers,
Mike

-- 
Michael Droettboom
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

Re: [Matplotlib-users] latex labels on saved plots

[Ryan K. <rya...@gm...>]

usetex=true IS supported for eps.  I use epstopdf to get pdf's from there.

Ryan

On 9/21/07, Jordan Atlas <jc...@co...> wrote:
>
> >Do you have ghostscript installed? If you set verbose.level to debug or
> >debug-annoying, what do you get?
> >
> >
> >
>
> I realized that the ghostscript path wasn't set up properly, so that was
> what was causing part of the problem with EPS files.  It works sometimes
> now (sometimes the EPS is just a blank file, even though the plot shows
> up properly when I do pylab.show().  I'm still trying to narrow down
> what ameks the difference here).
>
> >>I guess I mean TeX-like mathtext format parsed by matplotlib.  For
> >>example, I'm using things like this:
> >>
> >>rc('text', usetex=True)
> >>Plotting.xlabel(r'\textbf{Time (s)}', fontsize=16)
> >>
> >>
> >
> >usetex=True means that you are trying to use an external TeX program.
> >
> >
> >
>
> Ok, so am I to understand that usetex=True is not supported for PDF/EPS
> output?  Can you explain what the "Tex-like mathtext format parsed by
> matplotlib" is?
>
> Thank you for your assistance,
>
> --Jordan
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2005.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>