You did not say what variable you want to be in the ranges to determine the colors, but try any of these to see if they do what you want:
> x <- runif(100) > y <- runif(100) > z <- runif(100) > plot(x,y, pch=16, col=ifelse( x < 0.5, 'blue','red')) > plot(x,y, pch=16, col=ifelse( y < 0.5, 'blue','red')) > plot(x,y, pch=16, col=ifelse( z < 0.5, 'blue','red')) > > library(TeachingDemos) > y[1] <- 0.5 > plot(x,y, pch=16, col='red,) > clipplot( points(x,y,pch=16,col='blue'), ylim=c(0,0.5) ) The last one is probably overkill, but can give a nice effect with larger cex values. If none of those work for you, restate the question with better detail. Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of dxc13 > Sent: Wednesday, January 16, 2008 1:35 PM > To: r-help@r-project.org > Subject: [R] color ranges on a 2D plot > > > useR's > > I am trying to color the points on a scatter plot (code > below) with two colors. Red for values 0.5 -1.0 and blue for > 0.0 - .49. Does anyone know a easy way to do this? > > x <- runif(100, 0, 1) > y <- runif(100, 0, 1) > plot(y ~ x, pch=16) > > Thanks, > dxc13 > -- > View this message in context: > http://www.nabble.com/color-ranges-on-a-2D-plot-tp14893457p148 > 93457.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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.
