On Wed, Sep 17, 2008 at 3:11 PM, Gillian Silver <[EMAIL PROTECTED]> wrote: > What would I do if I have something like: > > x <- rnorm(1:1000) > y <- rnorm(1:1000) > z <- x + y > > and I want the rainbow to increase with z? (i.e., red for lowest z...all the > way up to the last color in the rainbow for the highest z)
Do you mean something like the following? z <- rnorm(1000, sd = sqrt(2)) plot(z, col = rainbow(length(z), end = 5/6)[rank(z)], pch = 19) > > On Wed, Sep 17, 2008 at 2:05 PM, stephen sefick <[EMAIL PROTECTED]> wrote: > >> plot(1:20, col=rainbow(20)) >> >> On Wed, Sep 17, 2008 at 4:58 PM, Gillian Silver <[EMAIL PROTECTED]> >> 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? >> > >> > Thanks! >> > >> > [[alternative HTML version deleted]] >> > >> > ______________________________________________ >> > 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. >> > >> >> >> >> -- >> Stephen Sefick >> Research Scientist >> Southeastern Natural Sciences Academy >> >> Let's not spend our time and resources thinking about things that are >> so little or so large that all they really do for us is puff us up and >> make us feel like gods. We are mammals, and have not exhausted the >> annoying little problems of being mammals. >> >> -K. Mullis >> > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. > ______________________________________________ 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.