matplotlib-users

[Matplotlib-users] Savefig('file.pdf') error with latex custom font

[David K. <dav...@gm...>]

Hello,
I am getting an error with savefig and pdf when I try to used matplotlib
with latex font rendering (attached below). In etc/matplotlibrc, I set
text.latex.preamble : \usepackage{MinionPro},
\renewcommand{\sfdefault}{Myriad-LF}
It seems that the dviread backend does not find a specific *.vf,
MinionPro-It--lcdfj.vf to be specific,
 file that is not needed in my opinion. Any ideas how to solve that?
Thanks,
David

------------------------------------------------------------------------------------
Traceback (most recent call
last):
  File "niotrode_tipz.py", line 71, in
<module>

p.savefig('niotrode_impedance_plot.pdf')
  File "/usr/lib/python2.5/site-packages/matplotlib/pyplot.py", line 342, in
savefig
    return fig.savefig(*args,
**kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line 964, in
savefig
    self.canvas.print_figure(*args,
**kwargs)
  File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_qt4agg.py",
line 147, in
print_figure

    FigureCanvasAgg.print_figure(self, *args,
**kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py", line
1310, in print_figure

**kwargs)

  File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py", line
1204, in print_pdf
    return pdf.print_pdf(*args,
**kwargs)
  File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_pdf.py", line
1864, in print_pdf

self.figure.draw(renderer)

  File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line 759, in
draw
    for a in self.axes:
a.draw(renderer)

  File "/usr/lib/python2.5/site-packages/matplotlib/axes.py", line 1523, in
draw

a.draw(renderer)

  File "/usr/lib/python2.5/site-packages/matplotlib/axis.py", line 733, in
draw

self.label.draw(renderer)

  File "/usr/lib/python2.5/site-packages/matplotlib/text.py", line 299, in
draw
    bbox, info =
self._get_layout(renderer)

  File "/usr/lib/python2.5/site-packages/matplotlib/text.py", line 199, in
_get_layout
    line, self._fontproperties,
ismath=self.is_math_text(line))
  File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_pdf.py", line
1560, in
get_text_width_height_descent

    page =
iter(dvi).next()

  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 62, in
__iter__
    have_page =
self._read()

  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 119,
in _read

self._dispatch(byte)

  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 207,
in _dispatch
    self._fnt_def(k, c, s, d, a, l,
n)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 368,
in _fnt_def
    vf =
_vffile(n[-l:])

  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 779,
in _vffile
    return _fontfile(texname, Vf, '.vf', _vfcache)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 768,
in _fontfile
    result = class_(filename)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 437,
in __init__
    self._read()
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 119,
in _read
    self._dispatch(byte)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 466,
in _dispatch
    Dvi._dispatch(self, byte)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 207,
in _dispatch
    self._fnt_def(k, c, s, d, a, l, n)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 504,
in _fnt_def
    Dvi._fnt_def(self, k, *args)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 368,
in _fnt_def
    vf = _vffile(n[-l:])
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 779,
in _vffile
    return _fontfile(texname, Vf, '.vf', _vfcache)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 768,
in _fontfile
    result = class_(filename)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 437,
in __init__
    self._read()
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 119,
in _read
    self._dispatch(byte)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 466,
in _dispatch
    Dvi._dispatch(self, byte)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 207,
in _dispatch
    self._fnt_def(k, c, s, d, a, l, n)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 504,
in _fnt_def
    Dvi._fnt_def(self, k, *args)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 370,
in _fnt_def
    self.fonts[k] = DviFont(scale=s, tfm=tfm, texname=n, vf=vf)
  File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 398,
in __init__
    for char in range(0, max(tfm.width)) ]
ValueError: max() arg is an empty sequence

Re: [Matplotlib-users] Savefig('file.pdf') error with latex custom font

[Jouni K. S. <jk...@ik...>]

"David Krapohl" <dav...@gm...>
writes:

> I am getting an error with savefig and pdf when I try to used matplotlib
> with latex font rendering (attached below). In etc/matplotlibrc, I set
> text.latex.preamble : \usepackage{MinionPro},
> \renewcommand{\sfdefault}{Myriad-LF}
> It seems that the dviread backend does not find a specific *.vf,
> MinionPro-It--lcdfj.vf to be specific,
>  file that is not needed in my opinion. Any ideas how to solve that?

Is that a commercial font? What exact files are installed when you
install that font in your texmf tree? Can dvipdfm/dvipdfmx/dvipdft
create a pdf file from a dvi file that uses this font?

>From your backtrace, it looks like dviread fails to parse a tfm file:

>   File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line 398,
> in __init__
>     for char in range(0, max(tfm.width)) ]
> ValueError: max() arg is an empty sequence

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

Re: [Matplotlib-users] Savefig('file.pdf') error with latex custom font

[David K. <dav...@gm...>]

On Thu, Oct 23, 2008 at 7:04 AM, Jouni K. Seppänen <jk...@ik...> wrote:

> "David Krapohl" <dav...@gm...>
> writes:
>
> > I am getting an error with savefig and pdf when I try to used matplotlib
> > with latex font rendering (attached below). In etc/matplotlibrc, I set
> > text.latex.preamble : \usepackage{MinionPro},
> > \renewcommand{\sfdefault}{Myriad-LF}
> > It seems that the dviread backend does not find a specific *.vf,
> > MinionPro-It--lcdfj.vf to be specific,
> >  file that is not needed in my opinion. Any ideas how to solve that?
>
> Is that a commercial font? What exact files are installed when you
> install that font in your texmf tree? Can dvipdfm/dvipdfmx/dvipdft
> create a pdf file from a dvi file that uses this font?
>

It is an adobe font that is bundled with the Acrobat Reader. It is an otf
font that was converted with "cfftot1" to *.pfb postscript font. Font
metrics and scripts can be downloaded at
http://developer.berlios.de/projects/minionpro/
I use it very often and so far I didn't have problems.


>
> >From your backtrace, it looks like dviread fails to parse a tfm file:
>
> >   File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line
> 398,
> > in __init__
> >     for char in range(0, max(tfm.width)) ]
> > ValueError: max() arg is an empty sequence
>

Yes, with --verbose-debug-annoying I can see that it stops at:
find_tex_file: MinionPro-It--lcdfj.vf ->
Followed by the same error message as in the first post. Unfortunately the
vf-file is not there but the tfm file. As far as I know does this file
describe the dotless-j for whatever reasons. So I think this particular file
is not very important for math output.


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

Re: [Matplotlib-users] Savefig('file.pdf') error with latex custom font

[Jouni K. S. <jk...@ik...>]

"David Krapohl" <dav...@gm...> writes:

>> >From your backtrace, it looks like dviread fails to parse a tfm file:
>>
>> >   File "/usr/lib/python2.5/site-packages/matplotlib/dviread.py", line
>> 398,
>> > in __init__
>> >     for char in range(0, max(tfm.width)) ]
>> > ValueError: max() arg is an empty sequence
>>
>
> Yes, with --verbose-debug-annoying I can see that it stops at:
> find_tex_file: MinionPro-It--lcdfj.vf ->

I was able to reproduce the problem, and have fixed the immediate
problem, so you should no longer get an exception with the latest trunk
version of matplotlib. However, the output seems to have some encoding
problems. I will look into the encoding issue, but cannot promise any
particular time frame for a solution. 

If using the Postscript backend and then converting to pdf is an option
for you, it may be a workaround.

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

Re: [Matplotlib-users] Savefig('file.pdf') error with latex custom font

[Jouni K. S. <jk...@ik...>]

I finally got around to addressing this issue from October:

"David Krapohl" <dav...@gm...> writes:
>> I am getting an error with savefig and pdf when I try to used
>> matplotlib with latex font rendering (attached below). In
>> etc/matplotlibrc, I set text.latex.preamble :
>> \usepackage{MinionPro},

Jouni K. Seppänen <jk...@ik...> writes:
> However, the output seems to have some encoding problems. I will look
> into the encoding issue, but cannot promise any particular time frame
> for a solution.

I think I have fixed the encoding bug in revision 6707. While the only
user-visible change should be that some custom LaTeX fonts now work
(specifically, large fonts such as Minion Pro and MnSymbol that need
several different encodings), the changes in backend_pdf.py were big
enough that I'm hesitant to check this in on the maintenance branch.

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