Simply use the col paramater, with a factor to index the colors. Example: # generate some data x <- rnom(100) y <- rnorm(x) z <- as.factor(rbinom(x,1,0.5))
# plot plot(x,y, col=c('red','blue')[z]) HTH, Matthieu ______________________________________________ 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.