Re: [Matplotlib-users] backend_agg attribute error

[Charlie M. <cw...@gm...>]

On 1/31/06, Strauss JM <jst...@su...> <jst...@su...> wrote:
> Here is what I did:
>
> I firstly downloaded the example "quadmesh_demo.py".
>
> Then I reinstalled the latest mpl (0.86.2).  When I tried to run the
> example I got the following error message:
>
> Traceback (most recent call last):
>   File "C:\My
> Leerkabinet\Installs\Python\Sandbox\Matplotlib\matplotlib\examples\quadm
> esh_demo.py", line 3, in ?
>     from pylab import figure,show
>   File "C:\Program Files\Python24\Lib\site-packages\pylab.py", line 1,
> in ?
>     from matplotlib.pylab import *
>   File "C:\Program
> Files\Python24\Lib\site-packages\matplotlib\pylab.py", line 217, in ?
>     new_figure_manager, draw_if_interactive, show =3D pylab_setup()
>   File "C:\Program
> Files\Python24\Lib\site-packages\matplotlib\backends\__init__.py", line
> 24, in pylab_setup
>     globals(),locals(),[backend_name])
>   File "C:\Program
> Files\Python24\Lib\site-packages\matplotlib\backends\backend_gtkagg.py",
> line 10, in ?
>     from backend_gtk import gtk, FigureManagerGTK, FigureCanvasGTK,\
>   File "C:\Program
> Files\Python24\Lib\site-packages\matplotlib\backends\backend_gtk.py",
> line 6, in ?
>     import gobject
> ImportError: No module named gobject
>
> I then went on and changed the backend in matplotlibrc from GTKAgg to
> WXAgg.  Running the example resulted in the following error message:
>
> Traceback (most recent call last):
>   File "C:\My
> Leerkabinet\Installs\Python\Sandbox\Matplotlib\matplotlib\examples\quadm
> esh_demo.py", line 15, in ?
>     ax =3D fig.add_subplot(111)
>   File "C:\Program
> Files\Python24\Lib\site-packages\matplotlib\figure.py", line 465, in
> add_subplot
>     a =3D Subplot(self, *args, **kwargs)
>   File "C:\Program Files\Python24\Lib\site-packages\matplotlib\axes.py",
> line 3974, in __init__
>     Axes.__init__(self, fig, [self.figLeft, self.figBottom,
>   File "C:\Program Files\Python24\Lib\site-packages\matplotlib\axes.py",
> line 331, in __init__
>     self._init_axis()
>   File "C:\Program Files\Python24\Lib\site-packages\matplotlib\axes.py",
> line 360, in _init_axis
>     self.xaxis =3D XAxis(self)
>   File "C:\Program Files\Python24\Lib\site-packages\matplotlib\axis.py",
> line 501, in __init__
>     self.cla()
>   File "C:\Program Files\Python24\Lib\site-packages\matplotlib\axis.py",
> line 524, in cla
>     self.majorTicks.extend([self._get_tick(major=3DTrue)  for i in
> range(1)])
>   File "C:\Program Files\Python24\Lib\site-packages\matplotlib\axis.py",
> line 834, in _get_tick
>     return XTick(self.axes, 0, '', major=3Dmajor)
>   File "C:\Program Files\Python24\Lib\site-packages\matplotlib\axis.py",
> line 100, in __init__
>     self.tick1line =3D self._get_tick1line(loc)
>   File "C:\Program Files\Python24\Lib\site-packages\matplotlib\axis.py",
> line 276, in _get_tick1line
>     markersize=3Dself._size,
>   File "C:\Program
> Files\Python24\Lib\site-packages\matplotlib\lines.py", line 211, in
> __init__
>     self.set_data(xdata, ydata)
>   File "C:\Program
> Files\Python24\Lib\site-packages\matplotlib\lines.py", line 282, in
> set_data
>     self._segments =3D unmasked_index_ranges(mask)
>   File "C:\Program
> Files\Python24\Lib\site-packages\matplotlib\lines.py", line 69, in
> unmasked_index_ranges
>     m =3D concatenate(((1,), mask, (1,)))
> ValueError: arrays must have same number of dimensions
>
> This problem I have encountered this morning.  Through a quick search I
> came upon advice by Travis Oliphant to obtain mpl out of CVS.  I only
> substituted my installed lines.py with the lines.py obtained from CVS
> and here is the results after running the example again:
>
> Traceback (most recent call last):
>   File "C:\My
> Leerkabinet\Installs\Python\Sandbox\Matplotlib\matplotlib\examples\quadm
> esh_demo.py", line 16, in ?
>     ax.pcolormesh(Qx,Qz,Z)
> AttributeError: Subplot instance has no attribute 'pcolormesh'
>
> It seems that we got passed ax =3D fig.add_subplot(111) in the example,
> but I am not sure whether the problem is solved.

I can't reproduce unfortunately.  This is an attribute for subplot
with my version.  Try print matplotlib.__version__ to ensure you are
not picking up on older files somehow.  Or try printing
matplotlib.axes.__file__ as well.