Paul Hiemstra skrev:
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.
I could use pch, but I'm already using symbols for another key.
Grrr. What am I missing?
Thanks!
Could you provide a small code sample that reproduces your problem
(like stated in the posting guide)? And also include the info from
sessionInfo().
cheers,
Paul
Hi
In addition to Paul's advice, you could try to convert the color column
to character in the plot-call. The column is most likely stored as
factor after the import of the csv-file. So maybe something like this
would work:
with(data, plot(X ~ Y, col=as.character(color)))
If not, see Paul's advice.
Ivar
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