Re: [Matplotlib-users] Color of masked values in pcolor plots

[Eric F. <ef...@ha...>]

On 2013/12/01 5:11 AM, lin...@eu... wrote:
> Z = X**2 + Y**2
> Z[(X**2+Y**2 < r**2) | (X**2+Y**2 > R**2)] = np.ma.masked

The problem is that Z is not a masked array.  Change the first line 
above to Z = np.ma.array(X**2 + Y**2).

Also, use pcolormesh instead of pcolor.  Pcolormesh is much faster.

Eric