How do I disable antialiasing on imshow with wxagg backend ?

I know I should find this in the documentation, but I am

    > finding all kinds of bells and whistles about the
    > interpolation and the fancy agg features except how to
    > disable antialiasing .

When you say antialiasing, do you mean interpolation? AFAIK,
antialiasing doesn't really come into play on the images.

Perhaps what you want is

ax.imshow(nx.mlab.rand(10,10), interpolation='nearest')