[Matplotlib-users] Weird white stripes when using matplotlib.pyplot countourf

[Ognjen I. <ogn...@gm...>]

Hello all,

I posted about this problem on another forum (with an image attachment)
http://python-forum.org/pythonforum/viewtopic.php?f=18&t=21951&p=99290#p99290

In the figure below white space that forms a trapezoid to the right
(slope then constant) and tear-shape white space to the left (due to
maxZ being too small) are expected and I have no issues with that.
The weird things are the sharp white shapes to the left. They are very
irregular and with a little different change in parameters they appear
at different places.

Below are the relevant pieces of code

Code: Select all
    import matplotlib.pyplot as plt
    import matplotlib.colors as colors
    ...
    z = numpy.transpose(z)
    z = numpy.ma.masked_where(z<=0, z)
    levels = numpy.linspace(0,maxZ,50)
    cset1=plt.contourf(x,y,z,levels,cmap=plt.get_cmap('jet',len(levels)-1))
    plt.colorbar(cset1)
    fname = 'pic.png'
    plt.savefig(fname)



Above, z is the 2D array of values for different x and y (both lists
have 400 elements each).
Ths is really really confusing me. Any help is greatly appreciated!