The built-in mathtext support does not support "\underline" (and never
did AFAICT).
It sounds like you had "text.usetex" turned on in your matplotlibrc, and
now for some reason or other you don't.
Cheers,
Mike
Nils Wagner wrote:
> Hi all,
>
> I have some trouble with the following lines
>
> title(r'$\underline{\lambda}_n$= '+str(f))
> plot(arange(0,len(data)),data,lw=2)
> xlabel('Iterations')
> ylabel('Largest eigenvalue')
> savefig('yuanlbl.png')
>
> IIRC the code worked before the recent changes in
> svn. How can I resolve the problem ?
>
>
> Traceback (most recent call last):
> File "yuan2.py", line 84, in <module>
> savefig('yuanlbl.png')
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/pyplot.py",
> line 269, in savefig
> return fig.savefig(*args, **kwargs)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/figure.py",
> line 782, in savefig
> self.canvas.print_figure(*args, **kwargs)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/backend_bases.py",
> line 1195, in print_figure
> **kwargs)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/backends/backend_gtkagg.py",
>
> line 103, in print_png
> return agg.print_png(filename, *args, **kwargs)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/backends/backend_agg.py",
>
> line 396, in print_png
> self.draw()
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/backends/backend_agg.py",
>
> line 358, in draw
> self.figure.draw(self.renderer)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/figure.py",
> line 624, in draw
> for a in self.axes: a.draw(renderer)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/axes.py",
> line 1345, in draw
> a.draw(renderer)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/text.py",
> line 317, in draw
> bbox, info = self._get_layout(renderer)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/text.py",
> line 201, in _get_layout
> line, self._fontproperties,
> ismath=self.is_math_text(line))
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/backends/backend_agg.py",
>
> line 233, in get_text_width_height_descent
> self.mathtext_parser.parse(s, self.dpi.get(), prop)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/mathtext.py",
> line 2729, in parse
> box = self._parser.parse(s, font_output, fontsize,
> dpi)
> File
> "/usr/local/lib64/python2.5/site-packages/matplotlib/mathtext.py",
> line 2204, in parse
> str(err)]))
> ValueError:
> $\underline{\lambda}_n$= 443.75221866615522
> ^
> Expected end of text (at char 0), (line:1, col:1)
>
> Nils
>
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--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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