kerfuffle wrote:
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.
Hi kerfuffle,
You might want to look at color.scale in the plotrix package that
transforms numeric values into colors as well as the rainbow function
that Sarah mentioned.
Jim
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