On Thu, Sep 15, 2011 at 7:12 AM, Nils Wagner
<nwag...@iam.uni-stuttgart.de>wrote:
> Hi all,
>
> I am looking for a simple method to generate various
> colours (n > 15, n denotes the number of colours) for a
> stacked bar plot.
>
> Any pointer would be appreciated.
>
> The example
> http://matplotlib.sourceforge.net/examples/pylab_examples/table_demo.html
> generates pastel colours. However the difference between
> the different colors decreases drastically.
>
You might try using one or more of the default
colormaps<http://matplotlib.sourceforge.net/examples/pylab_examples/show_colormaps.html>to
generate colors. For example:
>>> for n in np.linspace(0, 1, 20):
>>> plt.plot(n, 0, 'o', mfc=plt.cm.Set1(n))
will plot 20 points in a line with a different color for each dot.
Nevertheless, some colors are difficult to differentiate. Instead of
grabbing all your colors from one colormap you could grab the first 10 from
a pastel colormap (e.g. 'Set3') and then the next 10 from a dark colormap
(e.g. 'Dark2') and maybe even some more from a bright colormap (e.g.
'spectral').
You'll probably have to tweak these colormaps before they are properly
differentiated (i.e. you might not be able to get away with evenly-spaced
indexes into the colormap), but something like this should work.
Best,
-Tony
(Sorry for the duplicate email, Nils, but I forgot to reply all).
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