Set mask for matplotlib tricontourf

Question

I have some numpy array containing data that I would visualize on a 2D grid. Some of the data is unphysical and I would like to mask this data. However, I could not figure o

Answer 1

wsj's answer didn't work for me since it didn't remove certain masked points (I think when not all of the nodes where bad).

This solution did:

z[isbad] = numpy.NaN
z = numpy.ma.masked_invalid(z)
vmin, vmax = z.min(), z.max()
z = z.filled(fill_value=-999)

levels = numpy.linspace(vmin, vmax, n_points)
plt.tricontourf(x, y, z, levels=levels)