Hi Jo, To have some more flexibility with coloring I use the following, e.g. with rainbow colors:
col<- rainbow(255,end=5/6) colid <- function( x, range=NULL, depth=255 ) { if ( is.null( range ) ) y <- as.integer(x-min(x))/(max(x)-min(x))*depth+1 else { y <- as.integer(x-range[1])/(range[2]-range[1])*depth+1 y[ which( y < range[1] ) ] <- 1 y[ which( y > range[2] ) ] <- depth } y } plot( iris[,1],iris[,2],col=col[ colid(iris[,3]) ] ) Hope it helps, Tsjerk On Wed, Mar 18, 2009 at 9:15 AM, Usuario R <r.user.sp...@gmail.com> wrote: > Hi, > > Are your variable numerical? If so, you can do what you want by just define > the color as the variable (col = variable3). Colors in R can be defined by > numbers, so each number will corresponds to one color. > > In example: > > plot( iris[, 1], iris[, 2], col = iris[,3]) > > > Regards > > > > 2009/3/18 Josh <tejalonl...@gmail.com> > >> Hi, >> I have three related variables (vectors) and would like to see their >> distribution on a 2D plot of first two variables, having colors >> proportional >> to the values from third variable. I could have done so by passing 3rd >> variable to the color palette, but this would disrupt the relationship >> information among them. >> I am sure there has to be some way to do it, but I don't know how. Any help >> in this direction will be appreciated. >> >> thanks >> jo >> >> [[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. >> > > [[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. > -- Tsjerk A. Wassenaar, Ph.D. Junior UD (post-doc) Biomolecular NMR, Bijvoet Center Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands P: +31-30-2539931 F: +31-30-2537623 ______________________________________________ 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.