Hi matplotlib users,
The script below produces weird arrows when using numpy 1.2.1 and
matplotlib trunk. When I reinstall numpy 1.2.0 instead it seems fine.
I use the Agg backend. I am not sure where to start in tracking the
bug down so I will just post the rather sparse information that I
have.
Please let me know if you need any further information from me.
Best regards,
Jesper
import math
import numpy.ma as ma
import pylab as p
a = ma.ones((10,10))
a[:2,:] = ma.masked
a[:,9:] = ma.masked
b = ma.array(-a)
nx, ny = a.shape
for i in range(nx):
for j in range(ny):
a[i,j] = a[i,j]*math.cos(i*j)
b[i,j] = -b[i,j]*math.sin(i*j)
print a
p.quiver(a,b)
p.grid(True)
p.savefig('test1.png')
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