Z axis bug in plot_wireframe?

Hi,

I’m new here so sorry in advance if this has already been addressed
and I missed it in my archive search…

I think there is a significant bug in plot_wireframe in matplotlib
where it incorrectly displays the Z axis values. The code below

demonstrates the problem:

import scipy
import pylab as p
import matplotlib.axes3d as p3
from numpy import *

“”"

If you do a wire frame of the following, the graph is correct:

Z = scipy.array(
[[ 0.52, 0.00020],
[ 0.45, 0.00018],
[ 0.34, 0.00016]] )
“”"

but if you put negative signs in:

Z = scipy.array(
[[ -0.52, -0.00020],
[ -0.45, -0.00018],

[ -0.34, -0.00016]] )

“”"
the graph displays:
[[ -0.62, -0.10020 ],
[ -0.55, -0.10018 ],
[ -0.44, -0.10016 ]]
“”"

X, Y = meshgrid(arange(0, 3, 1.0), arange(0, 4, 1.0))

fig = p.figure()
ax = p3.Axes3D(fig)
ax.plot_wireframe(X, Y, Z)

ax.set_xlabel(‘X’)
ax.set_ylabel(‘Y’)
ax.set_zlabel(‘Z’)

p.show()

I’m running Ubuntu 7.10 x64 with python 2.5.1-1ubuntu2 and

python-scipy 0.5.2-9ubuntu4 both installed from the .deb files.
I sent the above code to somebody with a 32bit Linux system
and they had the same problem.

Any help appreciated!

Cheers
Shane