#42 problem with 3D vector field plotter

[Raphael Jolly]

Trying:

Plotting Tools
Vector Field Plotter
3D Vector Field

M(x,y,z)=0
N(x,y,z)=0
P(x,y,z)=z

Vector Field: all vectors go to the upper left corner.
Direction Field: all vectors are null.

This doesn't happen with e.g.

M(x,y,z)=x
N(x,y,z)=0
P(x,y,z)=0

My version of java is:

java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition
(build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)