On 17/09/2008 4:58 PM, Gillian Silver wrote:
Hi, how can I create a rainbow gradient in R? For example, let's say I have a plot of y = x...and I want the plot to go from red -> orange -> yellow -> green -> blue -> etc. Right now, I know how to do something like go from red to blue, using the plotrix library:library(plotrix) redToBlue <- color.scale(x,redrange=c(0,1),greenrange=c(0,1),bluerange=c(0,1),extremes=c("red","blue")) plot(x, y, col=redToBlue) But I can't figure out how to make the colors a rainbow. (I don't understand how the redrange, greenrange, and bluerange parameters in color.scale work.) Could someone please help?
Others have pointed you to the rainbow() function; you should also look at colorRamp, in case you want to construct your own colour sequence.
Duncan Murdoch ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
