[R] gradient generation

[Annemarie Verkerk]

Dear R-help subscribers;

I have a question regarding making gradients in R. I've searched on the 
web, but was only able to find functions that make a gradient between 
color X and Y, which is not what I want.

I want to 'pick out' individual, smaller pieces of a gradient based on a 
range of numbers. Say that I have a range of numbers, leading from 0 to 
1. Then I want 0 to refer to the brightest red, and 1 to the brightest 
blue, and all values in between refer to shades of purple. (So, 0.5 
would be regular purple, 0.7 would be a quite bluish purple, etc.)

Then, I want to be able pick out a gradient from the larger 0-1 
gradient, say for instance the gradient between 0.25 and 0.35 and refer 
to this with an object name for further use.

I'm not sure whether this is possible - maybe it would only be possible 
to define a range of individual R colors first that already form a 
gradient, and then 'pick out' the colors that you want to make the 
gradient.

In any case, I'm sure one could do this somehow in R!

Thanks for your help,
Annemarie

-- 
Annemarie Verkerk, MA
Evolutionary Processes in Language and Culture (PhD student)
Max Planck Institute for Psycholinguistics
P.O. Box 310, 6500AH Nijmegen, The Netherlands
+31 (0)24 3521 185
http://www.mpi.nl/research/research-projects/evolutionary-processes