On 2012-07-09 06:13, Benjamin Root wrote:
> On Sun, Jul 8, 2012 at 9:04 PM, Brendan Barnwell<brenb...@brenbarn.net>wrote:
>> cs = pyplot.contourf(x,y,z,levels=np.arange(50, 220, 20),
>> cmap=pyplot.cm.jet, extend='both')
>> cs.cmap.set_under('k')
>> cs.set_clim(50, 210)
>> cb = pyplot.colorbar(cs)
>>
>> But why do I have to do this? The whole reason I passed in my
>> specified levels was because I wanted THOSE to be the data limits.
>> Why is matplotlib expanding the data limits, and thus preventing me
>> from specifying the "out of range" color using the normal set_under
>> and set_over methods?
>>
>>
> You are right, that behavior is very inconsistent with the documentation.
> Looking over the QuadContourSet._process_levels() method, I doubt the
> problem lies there. While testing, I noticed that whatever color I set for
> set_under() was always being ignored in the colorbar. I suspect the
> problem lies there.
You mean in the colorbar and/or set_under? I don't think so, because
the problem occurs whether or not you use a colorbar, and, at least
for me, set_under works as long as the data limits are set correctly.
If in my code above, I change set_under("k") to set_under("yellow")
or whatever else I like, that color is correctly used both in the
contourf plot and on the colorbar (on the lower arrow). The code that
I pointed to in _process_levels is setting vmin and vmax. It's
possible this isn't the root of the problem, but the code certainly
looks strange and unmotivated, and it is what's causing incorrect clim
to be set.
--
Brendan Barnwell
"Do not follow where the path may lead. Go, instead, where there is
no path, and leave a trail."
--author unknown
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