[R] color code from csv

kerfuffle pswi at ceh.ac.uk
Fri Oct 3 21:10:26 CEST 2008

hi folks,

this is driving me up the wall.  Apologies for posting twice in the same
week, I'm writing up a thesis.  I wish to color-code some dots in an xy
plot.  I've got a csv file with various elements, one of which is the
color-key (with the header 'color').  If the color-key is decimal (eg.
1,2,3) then I can use
plot (X ~ Y, col=data$color) 
The problem, however, is that using decimal numbers I can only produce 8
colors.  It starts to recyle them after that (so, if possible values of my
color column are 1,2,3,4,5,6,7,8,9,10,11, the values 1 and 9 both produce
red, 2 and 10 produce black).  However, I knew I could get more colors by
using hexadecimal (tested with the legend)  So, I carefully produced a csv
file with hexadecimal values instead of decimal ones (eg. elements in the
column are #ffffff, #ff0000) but if I use col=data$color it doesn't work,
the entire plot is white.  If I use these set of hexadecimal values in the
legend, it works fine and I get lovely colors.  

I could use pch, but I'm already using symbols for another key.    

Grrr.  What am I missing? 

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