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It's a bug in the contour function. 
In axes.py, in function 'contour', put the line 
y, x = indices((jmax,imax), 'd')
in a condition, for example:
if x == None and y == None:
 y, x = indices((jmax,imax), 'd')
A permanent fix will go in CVS next week.
Nadia Dencheva
---- Original message ----
>Date: 2005年1月01日 08:05:12 -0700
>From: Jeff Whitaker <js...@fa...> 
>Subject: [Matplotlib-users] contour question 
>To: "'matplotlib-users'" <mat...@li...>
>
>Hi all:
>
>I was experimenting with the contour demo and discovered that
the x and 
>y keyword arguments don't behave like I expect them to (i.e.
they don't 
>behave as they do in pcolor).
>
>For example:
>
>from pylab import *
>delta = 0.025
>x = y = arange(-3.0, 3.0, delta)
>X, Y = meshgrid(x, y)
>Z1 = bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
>Z2 = bivariate_normal(X, Y, 1.5, 0.5, 1, 1)
>#levels, colls = contour(Z2-Z1, x=X,y=Y,levels=6,
># linewidths=arange(.5, 4, .5),
># colors=('r', 'green', 'blue', (1,1,0), 
>'#afeeee', 0.5),
># origin='lower')
>pcolor(X,Y,Z2-Z1,shading='flat')
>show()
>
>plots the data with the x and y axes going from -3 to +3. 
Uncommenting 
>the contour call, the axes then are the same as the
dimensions of the Z 
>array, regardless of whether the x=X, y=Y keyword args are
given. In 
>other words, contour seems to ignore the x,y keywords. Am I
missing 
>something?
>
>-Jeff
>
>-- 
>Jeffrey S. Whitaker Phone : (30the3)497-6313
>NOAA/OAR/CDC R/CDC1 FAX : (303)497-6449
>325 Broadway Web : http://www.cdc.noaa.gov/~jsw
>Boulder, CO, USA 80305-3328 Office: Skaggs Research Cntr 1D-124
>
>
>
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I'm taking off this afternoon for a vacation in sunny Brazil! So I
may not be as responsive around here as I sometimes am, though I will
be occasionally checking my email.
Hold down the fort, and I'll think warmly of all of you who may be
stuck in the northern hemisphere :-)
JDH

Hi all:
I was experimenting with the contour demo and discovered that the x and 
y keyword arguments don't behave like I expect them to (i.e. they don't 
behave as they do in pcolor).
For example:
from pylab import *
delta = 0.025
x = y = arange(-3.0, 3.0, delta)
X, Y = meshgrid(x, y)
Z1 = bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
Z2 = bivariate_normal(X, Y, 1.5, 0.5, 1, 1)
#levels, colls = contour(Z2-Z1, x=X,y=Y,levels=6,
# linewidths=arange(.5, 4, .5),
# colors=('r', 'green', 'blue', (1,1,0), 
'#afeeee', 0.5),
# origin='lower')
pcolor(X,Y,Z2-Z1,shading='flat')
show()
plots the data with the x and y axes going from -3 to +3. Uncommenting 
the contour call, the axes then are the same as the dimensions of the Z 
array, regardless of whether the x=X, y=Y keyword args are given. In 
other words, contour seems to ignore the x,y keywords. Am I missing 
something?
-Jeff
-- 
Jeffrey S. Whitaker Phone : (30the3)497-6313
NOAA/OAR/CDC R/CDC1 FAX : (303)497-6449
325 Broadway Web : http://www.cdc.noaa.gov/~jsw
Boulder, CO, USA 80305-3328 Office: Skaggs Research Cntr 1D-124