Re: [Matplotlib-users] parametric line color

On 07/31/2011 04:05 AM, Alan G Isaac wrote:
> On 7/30/2011 12:03 AM, Alan G Isaac wrote:
>> I'd like to pick the color for each line
>> based on its parameter value by mapping
>> possible parameter values to the colors
>> in a color map (e.g., gist_rainbow),
>> retrieving colors one at a time (based
>> on the parameter value for a line).
>
>
>
> As far as I can tell, the answer is the following.
> 1. scale the parameter to fall in (0,1)
> 2. get a color (rgba tuple) as cm.gist_rainbow(scaled_param)
> 3. plot using that color

For completeness: You can call a Colormap instance with either a float 
in (0,1), or equivalently with an integer in (0, N-1), where N is the 
number of discrete colors in the lookup table, excluding the over, 
under, and "bad" colors.  The standard colormaps in cm are all created 
with N=mpl.rcParams['image.lut'], defaulting to 256, but you can make a 
colormap with any value of N.

Eric

>
> This works.
>
> Cheers,
> Alan Isaac
>
>
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