I tried the code you supplied and I didn't get it to work with the *angles*

keyword, I got:

"ValueError: shape mismatch: objects cannot be broadcast to a single shape"

I have matplotlib.__version__ = '0.98.5.2'.

Although after thinking about it for a while I did:

from scipy import *

import matplotlib.pyplot as plt

X,Y = meshgrid(arange(64),arange(64)) # a bit bigger just to see what it

looks like

angles = arange(0,4*pi,4.*pi/X.size) # just creating a set of angles

u = cos(angles)

v = sin(angles)

c = arange(u.size) # the colours!

c.shape = X.shape

plt.quiver(X, Y, u, v, c, pivot='middle',minlength=0.04, width=0.05,

headwidth=1,scale=50)

that is, the angles are converted to "u" and "v" parameters.

Anyway. That is how I got it working.

efiring wrote:

## ···

Example with ipython -pylab:

x = arange(4)

y = arange(5)

X, Y = meshgrid(x, y)

u = ones_like(X)

v = zeros_like(X)

c = arange(u.size) # values mapped to colors

angles = (X * 20 + Y * 20).ravel()

quiver(X, Y, u, v, c, angles=angles)

axis([-1, 4, -1, 5])

The .ravel() of the angles is to get around a bug that I fixed a few

minutes ago in svn.

Eric

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