Paul Roebuck wrote:
Based on reading 'rgb'
So, why are you not using rgb()?
documentation, I would have thought
the following would have produced identical results. Can
someone explain how to make this happen? I need to be able
to specify an array of rgb values for the 'col' parameter.
colnames.col - c(black, red, blue, green)
colnames.rgb - apply(as.matrix(colnames.col), 1, col2rgb)
dimnames(colnames.rgb)[[2]] - colnames.col
baseline - 1:32
offset2 - 2*baseline
offset3 - 3*baseline
offset4 - 4*baseline
offsets - cbind(offset2, offset3, offset4)
# Produces expected result
X11()
matplot(baseline, col = colnames.col[1], type = l)
matlines(offsets, col = colnames.col[-1])
# Displays a ??yellow?? line
X11()
matplot(baseline, col = as.matrix(colnames.rgb[,1]), type = l)
matlines(offsets, col = colnames.rgb[,-1])
Yes, because 255 is a color number that is interpreted as yellow.
Why do you think you can specify a matrix of integer values and R knows
that you mean an rgb representation rather than color numbers?
What you can do now (but I don't think you really want to do it this
way!) is:
cn - apply(colnames.rgb, 2,
function(x) rgb(x[1], x[2], x[3], maxColorValue=255))
matplot(baseline, col = cn[1]), type = l)
matlines(offsets, col = cn[-1])
Uwe Ligges
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