sequence over colors in R

Question

Is there a way to create a sequence over colors in R?

for example, anything like:

 seq("#000000", "#999999", length=20)

Answer 1

See colorRampPalette and the related colorRamp function.

palette <- colorRampPalette(colors=c("#000000", "#FFFFFF"))
cols <- palette(20)
plot(1:20, col=cols, pch=16, cex=3)

For some other interesting options, check out the colorspace package, loading it and then doing example(rainbow_hcl) and then, if you're intrigued by what you see, vignette("hcl-colors").