The segment below is supposed to plot two columns of (x,y) data and do 
it in an area 640x480. Apparently, I'm missing how to use v to get this 
done. It dies at col.axis(v) with list object has no attribute 'axis'. 
 From looking at some MPL examples, it's not clear to me how one uses 
axis here. I might have needed axes, but that doesn't work either.  
Comments?


...
         trk_stats = (amin, amax, mean, std, per_tile25, per_tile50, 
per_tile75)
         fig = figure()
         ax1 = fig.add_subplot(111)
         v = (0, 640, 0, 480)
         print "shapes: ", xy[:,0].shape, xy[:,1].shape
         col = ax1.plot(xy[:,0], xy[:,1])
         col.axis(v)
         show()
         print "something for wtw plot"
         print
         return trk_stats




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