[Matplotlib-users] failed to save in 'eps' format when I use latex environment

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I'm using matplotlib 0.9.12 from ubuntu hardy 8.04.

To take advantage of the LaTeX handling capability in matplotlib,
I've added next two lines in /etc/matplotlib

text.usetex         : True
text.latex.preamble :  \usepackage{amsmath}

Then, I tried next test code.

from pylab import *
x = []; y = []
figure(figsize=(2,2))
plot(x,y,label=r'$\theta=$0.0deg'); axis([0,1,0,1]); legend()
text(0.5, 0.5, r'\begin{align*}x&=\alpha\\y&=\beta\end{align*}')
savefig('test.eps')

However, I've got the following error message without a resulting eps file.

====================================================================

Traceback (most recent call last):
  File "test.py", line 6, in <module>
    savefig('test.eps')
  File "/usr/lib/python2.5/site-packages/matplotlib/pyplot.py", line 269, in
savefig
    return fig.savefig(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line 782, in
savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py", line
1195, in print_figure
    **kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py", line
1099, in print_eps
    return ps.print_eps(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_ps.py",
line 1018, in print_eps
    return self._print_ps(outfile, 'eps', *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_ps.py",
line 1041, in _print_ps
    orientation, isLandscape, papertype)
  File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_ps.py",
line 1289, in _print_figure_tex
    orientation)
  File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_ps.py",
line 1376, in convert_psfrags
    \nHere is the full report generated by LaTeX: \n\n%s'% fh.read())
RuntimeError: LaTeX was not able to process your file:
Here is the full report generated by LaTeX:

This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6)
 %&-line parsing enabled.
entering extended mode
(/tmp/8c18ecc500de49027f0ed1df1bec10b8.tex
LaTeX2e <2005/12/01>
Babel <v3.8h> and hyphenation patterns for english, usenglishmax, dumylang,
noh
yphenation, loaded.
(/usr/share/texmf-texlive/tex/latex/base/article.cls
Document Class: article 2005/09/16 v1.4f Standard LaTeX document class
(/usr/share/texmf-texlive/tex/latex/base/size10.clo))
(/usr/share/texmf-texlive/tex/latex/type1cm/type1cm.sty)
(/usr/share/texmf-texlive/tex/latex/psnfss/helvet.sty
(/usr/share/texmf-texlive/tex/latex/graphics/keyval.sty))
(/usr/share/texmf-texlive/tex/latex/psnfss/courier.sty)
(/usr/share/texmf-texlive/tex/latex/base/textcomp.sty
(/usr/share/texmf-texlive/tex/latex/base/ts1enc.def))
(/usr/share/texmf-texlive/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/usr/share/texmf-texlive/tex/latex/amsmath/amstext.sty
(/usr/share/texmf-texlive/tex/latex/amsmath/amsgen.sty))
(/usr/share/texmf-texlive/tex/latex/amsmath/amsbsy.sty)
(/usr/share/texmf-texlive/tex/latex/amsmath/amsopn.sty))
(/usr/share/texmf-texlive/tex/latex/geometry/geometry.sty

Package geometry Warning: Over-specification in `h'-direction.
    `width' (614.295pt) is ignored.

Package geometry Warning: Over-specification in `v'-direction.
    `height' (794.96999pt) is ignored.

) (/usr/share/texmf-texlive/tex/latex/psfrag/psfrag.sty
(/usr/share/texmf-texlive/tex/latex/graphics/graphics.sty
(/usr/share/texmf-texlive/tex/latex/graphics/trig.sty)
(/etc/texmf/tex/latex/config/graphics.cfg)
(/usr/share/texmf-texlive/tex/latex/graphics/dvips.def)))
(/usr/share/texmf-texlive/tex/latex/graphics/graphicx.sty)
(/usr/share/texmf-texlive/tex/latex/graphics/color.sty
(/etc/texmf/tex/latex/config/color.cfg)
(/usr/share/texmf-texlive/tex/latex/graphics/dvipsnam.def))
(./8c18ecc500de49027f0ed1df1bec10b8.aux)
(/usr/share/texmf-texlive/tex/latex/base/ts1cmr.fd)
(/usr/share/texmf-texlive/tex/latex/psnfss/ot1pnc.fd)
<8c18ecc500de49027f0ed1df1bec10b8.eps>
(/usr/share/texmf-texlive/tex/latex/psnfss/ot1phv.fd)
! Missing \endgroup inserted.
<inserted text>
                \endgroup
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing } inserted.
<inserted text>
                }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing \endgroup inserted.
<inserted text>
                \endgroup
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing } inserted.
<inserted text>
                }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! LaTeX Error: There's no line here to end.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing $ inserted.
<inserted text>
                $
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing } inserted.
<inserted text>
                }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing } inserted.
<inserted text>
                }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing } inserted.
<inserted text>
                }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing \cr inserted.
<inserted text>
                \cr
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing { inserted.
<inserted text>
                {
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing { inserted.
<inserted text>
                {
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Extra }, or forgotten $.
<recently read> }

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing $ inserted.
<inserted text>
                $
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing } inserted.
<inserted text>
                }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Misplaced alignment tab character &.
<argument> x&=\alpha \\y&
                         =\beta
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing $ inserted.
<inserted text>
                $
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Misplaced \cr.
\math@cr@@@ ->\cr

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Misplaced \noalign.
\math@cr@@ ... \iffalse }\fi \math@cr@@@ \noalign
                                                  {\vskip #1\relax }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing $ inserted.
<inserted text>
                $
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing } inserted.
<inserted text>
                }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Extra }, or forgotten \endgroup.
\math@cr@@ ...th@cr@@@ \noalign {\vskip #1\relax }

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Misplaced \noalign.
\black@ #1->\noalign
                     {\ifdim #1>\displaywidth \dimen@ \prevdepth
\nointerlin...
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Extra }, or forgotten \endgroup.
\endalign ->\math@cr \black@ \totwidth@ \egroup
                                                \ifingather@\restorealignst...
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! LaTeX Error: \begin{figure} on input line 15 ended by \end{align*}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing $ inserted.
<inserted text>
                $
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Display math should end with $$.
<to be read again>
                   \endgroup
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing } inserted.
<inserted text>
                }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing } inserted.
<inserted text>
                }
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Extra }, or forgotten \endgroup.
\Gin@erotate ...angle {#1}\setbox \z@ \hbox {{#2}}
                                                  \Grot@x \z@ \Grot@y \z@\G...
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Undefined control sequence.
<argument> \Grot@angle

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing number, treated as zero.
<to be read again>
                   )
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Undefined control sequence.
<argument> \Grot@angle

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing number, treated as zero.
<to be read again>
                   )
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Undefined control sequence.
<argument> \Grot@angle

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing number, treated as zero.
<to be read again>
                   )
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Undefined control sequence.
<argument> \Grot@angle

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Missing number, treated as zero.
<to be read again>
                   )
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Undefined control sequence.
\Grot@start ...currentpoint translate \Grot@angle
                                                  \space neg rotate neg
exch...
l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Extra }, or forgotten \endgroup.
\mbox #1->\leavevmode \hbox {#1}

l.32 ...e=0]{8c18ecc500de49027f0ed1df1bec10b8.eps}

! Too many }'s.
\@endfloatbox ...pagefalse \outer@nobreak \egroup
                                                  \color@endbox
l.33 \end{figure}

! Extra \endgroup.
\color@endgroup ->\endgraf \endgroup

l.33 \end{figure}

! Too many }'s.
\color@endbox ->\color@endgroup \egroup

l.33 \end{figure}

! LaTeX Error: \begin{document} ended by \end{figure}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.33 \end{figure}

! Extra \endgroup.
<recently read> \endgroup

l.33 \end{figure}

[1] (./8c18ecc500de49027f0ed1df1bec10b8.aux) )
(see the transcript file for additional information)
Output written on 8c18ecc500de49027f0ed1df1bec10b8.dvi (1 page, 424 bytes).
Transcript written on 8c18ecc500de49027f0ed1df1bec10b8.log.

====================================================================

How can I save a plot with a LaTeX environment in eps format?

-- 
Yong-Duk Jin