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