[R] Plot symbols for more than 25 groups

[Ken Knoblauch]

A rainbow has a continuous distribution of wavelengths.  These are
not at all the same thing as colors!

Quoting Prof Brian Ripley <ripley at stats.ox.ac.uk>:

> 
> You would do well to get people to recognize more than a dozen spot
> colours, too -- we are tuned to recognizing quite large blobs of colour.
> We see only about a dozen colours in a rainbow, which has infinitely many 
> and they are adjacent.
> 
> -- 
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
> 
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____________________
Ken Knoblauch
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