Jesper Larsen wrote:
> 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.
It looks OK to me with mpl and numpy from svn.
Eric
>
> 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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