Re: [Matplotlib-users] colors

On 2014/06/18, 5:23 AM, Bruno Pace wrote:
> Ok, so using the norm=SymLogNorm I cannot distinguish the values that
> are exactly 0.0 from the really small ones, right? Would it be possible

Correct, the scale is linear for small values.

> to make use of the set_bad method without having to use masked arrays,
> just combining the SymLogNorm and the set_bad?

No, the mask is what identifies a point as bad.  If you want to 
distinguish zero from non-zero, no matter how small, then this is the 
way to do it.

zm = np.ma.masked_equal(z, 0, copy=False)

Now you have a masked array where the points that are exactly zero are 
masked.

The bad color won't show up on the colorbar, however.  There is no 
suitable place for it.  It can show only the range from vmin to vmax, 
and a "set_over" color for values greater than vmax, and a "set_under" 
color for values less than vmin.

Eric