Matplotlib/Pylab Error

Oscar Benjamin oscar.j.benjamin at gmail.com
Wed Dec 12 01:10:33 CET 2012


On 10 December 2012 20:40,  <subhabangalore at gmail.com> wrote:
> Dear Group,
>
> I am trying to enumerate few interesting errors on pylab/matplotlib.
> If any of the learned members can kindly let me know how should I address them.
>
> I am trying to enumerate them as follows.
>
> i) >>> import numpy
>>>> import pylab
>>>> t = numpy.arange(0.0, 1.0+0.01, 0.01)
>>>> s = numpy.cos(2*2*numpy.pi*t)
>>>> pylab.plot(t, s)
> [<matplotlib.lines.Line2D object at 0x021122D0>]
>>>> pylab.show()
> Exception in Tkinter callback
> Traceback (most recent call last):
>   File "C:\Python26\lib\lib-tk\Tkinter.py", line 1410, in __call__
>     return self.func(*args)
>   File "C:\Python26\Lib\site-packages\matplotlib\backends\backend_tkagg.py", line 236, in resize
>     self.show()
>   File "C:\Python26\Lib\site-packages\matplotlib\backends\backend_tkagg.py", line 239, in draw
>     FigureCanvasAgg.draw(self)
>   File "C:\Python26\Lib\site-packages\matplotlib\backends\backend_agg.py", line 421, in draw
>     self.figure.draw(self.renderer)
>   File "C:\Python26\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "C:\Python26\Lib\site-packages\matplotlib\figure.py", line 898, in draw
>     func(*args)
>   File "C:\Python26\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "C:\Python26\Lib\site-packages\matplotlib\axes.py", line 1997, in draw
>     a.draw(renderer)
>   File "C:\Python26\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "C:\Python26\Lib\site-packages\matplotlib\axis.py", line 1045, in draw
>     tick.draw(renderer)
>   File "C:\Python26\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "C:\Python26\Lib\site-packages\matplotlib\axis.py", line 239, in draw
>     self.label1.draw(renderer)
>   File "C:\Python26\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "C:\Python26\Lib\site-packages\matplotlib\text.py", line 591, in draw
>     ismath=ismath)
>   File "C:\Python26\Lib\site-packages\matplotlib\backends\backend_agg.py", line 167, in draw_text
>     font.draw_glyphs_to_bitmap(antialiased=rcParams['text.antialiased'])
> TypeError: draw_glyphs_to_bitmap() takes no keyword arguments
>
> ii) Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>

The example above works for me just fine (in ipython):
In [1]: import pylab

In [2]: import numpy

In [3]: t = numpy.arange(0.0, 1.0+0.01, 0.01)

In [4]: s = numpy.cos(2*2*numpy.pi*t)

In [5]: pylab.plot(t, s)
Out[5]: [<matplotlib.lines.Line2D at 0x3c36310>]

In [6]: pylab.show()  # At this point a plot of cos(t) appears as expected


Have you customised your matplotlibrc file? I have no problems with the above,

>
> IDLE 2.6.1
>>>> import networkx as nx

Sorry, I don't have this module installed.


Oscar



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