Re: [matplotlib-devel] Development issue: Assign labels to colorbar extensions

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

On 2014/11/16, 10:21 AM, j1 wrote:
> I have posted this in the user sub forum as well because i'm not sure that it
> is a user issue or development issue.
> Information about my problem and my code are here
>
> http://matplotlib.1069221.n5.nabble.com/Assign-labels-to-colorbar-extensions-user-or-development-issue-td44392.html
> <http://matplotlib.1069221.n5.nabble.com/Assign-labels-to-colorbar-extensions-user-or-development-issue-td44392.html>
>
> Is it possible to assign tick labels/values to extensions?

You would have to do it manually; you can put marks and text anywhere 
you want in a matplotlib figure, but there is no mechanism for adding 
ticks to the extensions.  That's simply not what they are for.  They are 
intended only to indicate a single color to which values outside the 
vmin-to-vmax range of the norm are assigned.

>
> If so, how can I do it

It looks like you might be able to achieve what you want *without* using 
extensions, by using a custom colormap and/or norm.  You would extend 
the actual contour levels to include the full range you want "ticked and 
labeled", but you would use the colormap and/or norm to ensure those 
beyond a given range are mapped to the appropriate end color(s).

Eric