Re: [Matplotlib-users] Repeated calls to set_text using TeX formatting results in RuntimeError

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Michael et al.

  The r4633 patch fixes the problem indeed.  Thanks for your help!!

Brian
=20

-----Original Message-----
From: Michael Droettboom [mailto:md...@st...]=20
Sent: Tuesday, December 11, 2007 10:03 AM
To: Boonstra, Brian
Cc: mat...@li...
Subject: Re: [Matplotlib-users] Repeated calls to set_text using TeX
formatting results in RuntimeError

The patch for r4633 is pretty simple, so you could test it without
needing to check out from SVN or build your own matplotlib etc.

Open the file "font_manager.py", which should live in
"%PYTHONPATH%/Lib/site-packages/matplotlib".  Around line 681, you'll
find the function:

     def __hash__(self):
         return hash(repr(self.__props))

Change it to:

     def __hash__(self):
         return hash(repr(self.__props.__dict__))

(Obviously, back up the file first...)

Then try your script again.  If that doesn't work, I'll have to fire up
Windows some time to have a look -- I'm not able to reproduce this bug
on Linux.

Cheers,
Mike

Bri...@ub... wrote:
>> I believe this is a known bug with 0.90.1.  Are you able to run
> 0.91.1?
>=20
>=20
> I just upgraded and checked -- the bug still exists in 0.91.1.  I'm=20
> afraid I don't know whether it has been fixed by r4633 or not.
>=20
> Best,
>    Brian
>=20
>=20
> Bri...@ub... wrote:
>> I'm doing a parameter fitting exercise, and plotting the progress as=20
>> I
>=20
>> do so.  I have found that repeated calls to set_text() on a text=20
>> object will result in an error opening a font file iff the text uses=20
>> TeX formatting.  (I am not using the experimental usetex feature).
>>
>> I speculate that matplotlib is opening the font file anew with each=20
>> call to set_text and never closing it, resulting ultimately in having

>> too many files open.  Here is a brief program to reproduce this=20
>> behavior (WinXP, Py2.5, matplotlib 0.90.1):
>>
>>
>> from pylab import figure, axes, draw, ion from numpy import array,=20
>> cos, abs
>> ion()
>> fig=3Dfigure()
>> axs=3Daxes()
>> x=3Darray(range(100))/10.0
>> cosPlot=3Daxs.plot( x, cos(x)**2, 'r' ) powText =3D=20
>> axs.text(0.9,0.02,r'$\alpha=3D$',
>>
> horizontalalignment=3D'left',verticalalignment=3D'bottom',
>>                     transform =3D axs.transAxes)
>> draw()
>> for alpha in array(range(10,400))/100.0:
>>     axs.lines[-1].set_ydata( abs(cos(x))**alpha)
>>     powText.set_text(r'$\alpha=3D%.4g$'%alpha)
>>     print alpha
>>     draw()
>>   =20
>>
>>
>>
>>
>> Traceback (most recent call last):
>>   File "delme.py", line 16, in <module>
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\pylab.py",
>> line 754, in draw
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\backends\backend_tkagg.py",
>> line 154, in draw
>>
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\backends\backend_agg.py",
>> line 392, in draw
>>
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\figure.py",
>> line 601, in draw
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\axes.py",
>> line 1286, in draw
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\text.py",
>> line 410, in draw
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\text.py",
>> line 255, in _get_layout
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\backends\backend_agg.py",
>> line 246, in get_text_width_height
>>
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\mathtext.py",
>> line 1569, in __call__
>>   File
>> "C:\Python25\Lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matp
>> l
>> otlib\mathtext.py",
>> line 578, in __init__
>> RuntimeError: Could not open facefile=20
>> c:\Python25\lib\site-packages\matplotlib-0.90.1-py2.5-win32.egg\matpl
>> o
>> tlib\mpl-data\fonts\ttf\cmtt10.ttf;
>> Cannot_Open_Resource
>>
>>
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>=20
> --
> Michael Droettboom
> Science Software Branch
> Operations and Engineering Division
> Space Telescope Science Institute
> Operated by AURA for NASA
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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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