Hi all,
maybe I've misunderstood something concerning masking or quiver plots:
I want to exclude some data from a quiver plot. Here's an example:
--------------------8<----
import numpy as N
import pylab as pl
import matplotlib.numerix.ma as ma
# prepare data
X,Y = pl.meshgrid(range(5),range(5))
angles = pl.rand(5,5)
U = N.cos(angles)
V = N.sin(angles)
# prepare mask
M = N.zeros((5,5), dtype='bool')
M[2,2] = True
# apply mask
Um = ma.masked_array(U,mask=M)
Vm = ma.masked_array(V,mask=M)
# plot
pl.quiver(X,Y,Um,Vm)
# pl.plot(range(5),Um[2],'x')
pl.show()
---------------------->8----
Using the commented 'plot' command works as expected, but 'quiver' results in
empty axes. If I take U,V instead of Um,Vm, the arrows are drawn ..
What am I doing wrong or is there another way to exclude arrows from being
plotted?
Thank you in advance,
Michael
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