[Matplotlib-users] hexbin extent Attribute Error

[Alexandar H. <vio...@gm...>]

Hello,

I've been having fun using hexbin, but I'd like to have consistent bin sizes
and plot ranges for different sets of data. What I'm finding is that the bin
sizes are primarily determined by the input data mins and maxes. For
instance, I'm plotting data with something like:

#  import matplotlib.pyplot as plt

#  plt.hexbin(x,y, cmap=cm.hot, gridsize=(50,50))
#  plt.axis([xmin, xmax, ymin, ymax])
#  plt.title("2D Histogram")
#  cb = plt.colorbar()
#  cb.set_label('counts')

#  plt.show()

where xmin, etc are a fixed range. If my data sets span sizeably different
ranges, then the hexagon sizes come out completely different. I'd like to
avoid increasing the gridsize in one or both dimensions too much as that
would require very large grids in some instances.

I thought my solution to the problems would be to use the extent function in
hexbin but when I try, for instance:

#  plt.hexbin(x,y, cmap=cm.hot, gridsize=(50,50),
extent=[xmin,xmax,ymin,ymax])

I get these strange errors:

  File "HexPlotLog.py", line 64, in <module>
    plt.hexbin(x,y, cmap=cm.hot, gridsize=(50,50), extent=[xmin, xmax, ymin,
ymax])
  File "/usr/lib64/python2.5/site-packages/matplotlib/pyplot.py", line 1920,
in hexbin
    ret =  gca().hexbin(*args, **kwargs)
  File "/usr/lib64/python2.5/site-packages/matplotlib/axes.py", line 5447,
in hexbin
    collection.update(kwargs)
  File "/usr/lib64/python2.5/site-packages/matplotlib/artist.py", line 548,
in update
    raise AttributeError('Unknown property %s'%k)
AttributeError: Unknown property extent


The other thing I'd like to do is to set the background color of the plot to
black, or otherwise the same color as a bin of zero. I imagine this is
something I can find in the manuals, but since I'm asking questions, may as
well include it :)

I appreciate any help that can be offered.

Best,

Alex