[Matplotlib-users] custom colormap

[Randy H. <he...@in...>]

Apologies, but as usual, I'm under a bit of pressure to display a pcolor
using a custom colormap and it's not intuitively obvious how to do it (but
I'll keep looking).  If there's a kind soul out there who can quickly point
me/show me how, I'd appreciate it.  In my simple example, I want to have
just 4 bands of color:  2 shades of blue for all negative scalar values and
2 shades of red for all positive values.

thanks, Randy