[R] Plot symbols for more than 25 groups

Prof Brian Ripley ripley at stats.ox.ac.uk
Fri Apr 2 17:47:19 CEST 2004

On Fri, 2 Apr 2004, Ken Knoblauch wrote:

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

I did not say they were.  However, a rainbow has infinitely many colours
(it is show as an arc on a standard colour chart), and your statement
about `not at all the same thing'.

Note that R has a rainbow() function, and that too is nothing to do with 

> 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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