Great. Just what I needed. I appreciate it.
- James
On Feb 2, 2010, at 1:56 PM, Eric Firing wrote:
> James Conners wrote:
>> Hi,
>>
>> I'm having some trouble producing a filled contour how I want it.
>>
>> Say I'm plotting data over the range [1.2, 20] using 15 level lines evenly spaced
>> over that interval. I'd like the min of that interval to map to the min of the color spectrum (say "jet" so dark blue)
>> and the max of that interval to map to the max of the spectrum (so red). It doesn't seem to work that way.
>> When I do filled contours, sometimes the low values are mapped to black or dark gray and
>> sometimes they're mapped to blue.
>>
>> I always want the endpoints of the spectrum to map to the endpoints of the plotted values. Can this be done?
>> Any help is appreciated. Thanks.
>
> The root of the problem is a questionable choice I made in the
> _process_colors method of ContourSet; I will investigate either changing
> it, or making it an option. In the meantime, there is an easy
> workaround: just use the set_clim method of the ContourSet, or the
> pyplot.clim function. In ipython -pylab:
>
> z = rand(10,10)
> cs = contourf(z)
> cb = colorbar()
> cs.set_clim(cs.layers.min(), cs.layers.max())
> draw()
>
> The idea behind the present default choice for clim within contourf is that
> the range of colors covers values from the lowest contour level to the
> highest; the color of a *layer* is then the color of the midpoint
> between its bounding levels. This has some logic to it (and is more
> consistent with pcolor and image color mapping), but I agree that it
> probably makes more sense to use the full color range by default; most
> often, this is likely to be what one wants, and for the exceptions one
> can always use set_clim.
>
> Eric
>
>>
>> - James
>>
>>
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