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quiver vector plot problem

Hello All,
I am using matplotlib0.8. With the quiver function I
have tried to plot a vector. However for some reason I
do not get what I want.
I have problem with the S (according the comments a
scaling parameter) parameter. When I set it to 0 (S = 0
), I get the correct vector with correct direction,
however the arrow head is not present. When I set it to
2 (S= 2) for instance, I get a scaling which I dont
understand. The direction of my vector has changed.
This is something which I do not want. I was wondering
if this is a bug or whether it is my misunderstandin g
of this scaling parameter. What I want is no scaling
(S=0) but then an arrow with an arrow head. A scaling
might be useful in the future but then I think the
direction should not changed, since a vector is
characterized by its direction. Many thanks in advance
for whoever that can help me out with this problem.
Here below you can see my python code.

from pylab import *

X = array([ [3] ])
Y = array([ [3] ])

print "X = ",X
print "Y = ",Y

U = array([ [1] ])
V = array([ [2] ])

print "U = ",U
print "V = ",V
quiver(X, Y, U, V, 2.0, color=None, width=1.0)


Jul 19 '05 #1
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