Just from morbid curiosity, I installed networkx to see if I could see what is going on.  And the answer to your original question is that no, matplotlib doesn't have problems with multiple wx panels; I do this all the time.

Basically what is going on is that pylab is being used inside of networkx to issue the plotting commands.  That's a bad idea in general, because of just this type of situation.  Without getting in there and trying to fix networkx, I can at least make your script work by inserting this line:

def my_plot(figure):
    plt.figure(figure.number) <-------------------------------
    G = nx.star_graph(15)
    axes = figure.add_subplot(1,1,1)
    nx.draw_networkx(G, ax=axes)

to make sure that before nx.draw_networkx is invoked, the correct figure is current.  That's a kludge, but it does work.  The proper solution is to modify networkx to use the api's properly.  In particular, the glaring one is right at the top of 

site-packages/networkx/drawing/nx_pylab.py, line 119; that 

cf = pylab.gcf()

should at least be

if ax is None:
   cf = pylab.gcf()
   cf = ax.get_figure()

[I think]

The above should be reported to the networkx authors.

On Wed, Jul 11, 2012 at 1:02 PM, Daniel Hyams <dhyams@gmail.com> wrote:
To get rid of the networkx dependency, I just replaced my_plot() with this:

def my_plot(figure):
    axes = figure.add_subplot(1,1,1)

and also added "self.panel2.update_display()" in the constructor for MyFrame, and everything worked fine.  Could it be networkx caching a reference to a figure or axes that is really the problem?  Can you post the full stack trace instead of just the last line?

On Wed, Jul 11, 2012 at 12:45 PM, Joshua Koehler <jjkoehler9@gmail.com> wrote:
Hi all,

I am currently trying to have two panels each with their own figure instance so they can have separate plots.

I can successfully update a plot if there is only one panel. As soon as I add a second panel, I get the following error when I try to update (replot) a plot (Showing last message only):

File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/axes.py", line 1374, in _sci
    "Argument must be an image, collection, or ContourSet in this Axes")
ValueError: Argument must be an image, collection, or ContourSet in this Axes

I looked online first and one site suggested it was because I was using matplotlib.Figure instead of pylab.Figure. I switched and the problem still occurs. I was curious to see if this problem had to do with how I set up my program, not with matplotlib, so I wrote a little test program. The exact same problem occurs. I have attached the test program. To see that it does work with just one panel comment out lines 39, 41, and 49. When put back in, I get the above error message.

Any suggestions as to how to fix this?



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Daniel Hyams

Daniel Hyams