[Matplotlib-users] Gap when using contourf and nan's

[Bror J. <bro...@gm...>]

Dear all,

I'm trying to to show where one set of values have NaN's on the contour plot of another set of values. I do this by creating a mask as such:

fld = randn(4,4)
fld[:2,:2] = np.nan
mask[mask==0] = np.nan
contourf(arange(4),arange(4),fld)
contourf(arange(4),arange(4),mask)

The problem is that the mask patch doesn't cover the empty space in the fld contour. Is there any way to make this happen?

My ultimate goal is something like this:

fld2 = randn(4,4)
contourf(arange(4),arange(4),fld2)
contourf(arange(4),arange(4),mask,[1,1], extend='both', 
         colors='w', alpha=0.5)

to present where fld has NaN's on the fld2 plot.


Many thanks in advance!

Bror Jonsson


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