trouble with pyplot in os x

[Eric]

On Saturday, August 4, 2012 8:11:44 AM UTC-5, William R. Wing (Bill Wing) wrote:
> On Aug 3, 2012, at 11:12 PM, Eric  wrote:
> 
> 
> 
> > I'm just starting to futz around with matplotlib and I tried to run this
> 
> > example from the matplotlib doc page (it's the imshow() example):
> 
> > 
> 
> > import numpy as np
> 
> > import matplotlib.cm as cm
> 
> > import matplotlib.mlab as mlab
> 
> > import matplotlib.pyplot as plt
> 
> > 
> 
> > delta = 0.025
> 
> > x = y = np.arange(-3.0, 3.0, delta)
> 
> > X, Y = np.meshgrid(x, y)
> 
> > Z1 = mlab.bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
> 
> > Z2 = mlab.bivariate_normal(X, Y, 1.5, 0.5, 1, 1)
> 
> > Z = Z2-Z1  # difference of Gaussians
> 
> > 
> 
> > im = plt.imshow(Z, interpolation='bilinear', cmap=cm.gray,
> 
> >                origin='lower', extent=[-3,3,-3,3])
> 
> > 
> 
> > plt.show()
> 
> > 
> 
> > 
> 
> 
> 
> OK
> 
> 
> 
> > 
> 
> > I get the following error: 
> 
> > 
> 
> > Exception in Tkinter callback
> 
> > Traceback (most recent call last):
> 
> >  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1410, in __call__
> 
> >    return self.func(*args)
> 
> >  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py", line 248, in resize
> 
> >    self.show()
> 
> >  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py", line 252, in draw
> 
> >    tkagg.blit(self._tkphoto, self.renderer._renderer, colormode=2)
> 
> >  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/tkagg.py", line 19, in blit
> 
> >    tk.call("PyAggImagePhoto", photoimage, id(aggimage), colormode, id(bbox_array))
> 
> > TclError
> 
> > 
> 
> > 
> 
> 
> 
> This looks as though you are running the latest python from python.org, not the pre-installed python from Apple (that's good).
> 
> 
> 
> > 
> 
> > I'm using Python 2.7.3 on OS X 10.6.8 and I'm invoking python by doing
> 
> > "arch -i386 python" because matplotlib doesn't do 64-bit.  Has anyone
> 
> > else seen this?  Does anyone know why this is happening?  It looks
> 
> > like a problem with tkinter but beyond that I haven't a clue.  And,
> 
> > finally, any ideas as to how to make it behave?
> 
> > 
> 
> 
> 
> I DON'T know how tk is getting mixed into this, it shouldn't be.  But I think I can tell you how to get matplotlib working...
> 
> 
> 
> Matplotlib DOES do 64-bit, the problem is numpy, which as you download in binary form does not.  But, if you copy the bash script here:
> 
> 
> 
> 	https://raw.github.com/fonnesbeck/ScipySuperpack/master/install_superpack.sh
> 
> 
> 
> it will download the sources and build a 64-bit numpy, which will then give you a default 64-bit full package of python, numpy, and matplotlib.
> 
> 
> 
> That's what I've done, and my system runs the demo you listed in your post with no problems.
> 
> 
> 
> > TIA,
> 
> > eric
> 
> > -- 
> 
> > http://mail.python.org/mailman/listinfo/python-list
> 
> 
> 
> Good luck,
> 
> -Bill

Yes, I got the Python 2.7 (and 3.2) distributions from python.org and I also got Tcl/Tk per their directions.  I still have all the old Apple installed stuff too plus some older Tcl/Tk.

Doesn't matplotlib use Tk (Tkinter) to do its graphs and what-not?  I also have at least two different versions of Tcl/Tk (8.5.7 and 8.5.12) and I'm wondering if that may not be causing problems.

I'll give that bash script a try.

Thanks,
eric