You're right. It's a bug. The parser (when it was re-written) was
changed to not accept '[' as a literal symbol, since it is meaningful in
certain situations. This turned out to be overly cautious. This is
fixed in svn r4854.
Manuel Metz wrote:
> Michael Droettboom wrote:
>> You need to escape the [:
>>
>> mpl_pp.xlabel(r"$\[$")
>>
>> [] and {} have special meanings in math syntax, so to use them
>> "literally", they need to be escaped.
>
> Really? Note that Matthias had text.usetex=False.
> I tried various configurations:
>
> text.usetex=True
>
> xlabel( "$[$") okay
> xlabel(r"$\[$") okay
> xlabel( "$\[$") no error, but also no label displayed
I'm surprised by this. Those last two strings should be identical.
Maybe Python 2.5 works differently from whatever you're running.
> text.usetex=False
>
> xlabel("$[$") failed with
> Expected end of text (at char 0), (line:1, col:1)
>
> xlabel(r"$\[$")
> xlabel( "$\[$") no error, but displays a star symbol
>
> In the last two cases I got a warning
>
> mathtext.py:722: MathTextWarning: Unrecognized symbol '\['. Substituting
> with a dummy symbol.
> % sym.encode('ascii', 'backslashreplace'), MathTextWarning)
Cheers,
Mike
>> Matthias Michler wrote:
>>> Hello list,
>>>
>>> the little example below leads to an error on my system (output is
>>> attached).
>>> I used this some time ago and it worked. Now I'm using the release
>>> 0.91.2.
>>> Is there a reason to use rectangular brackets not in mathtext?
>>> (same problem occur with '{' for me.)
>>>
>>> best regards and thanks in advance for any help,
>>> Matthias
>>> -------------------------------------------------------------------------------------------------
>>>
>>>
>>> import matplotlib.pyplot as mpl_pp
>>> mpl_pp.axes()
>>> mpl_pp.xlabel("$[$")
>>> mpl_pp.show()
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
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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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