Hi [EMAIL PROTECTED] napsal dne 05.09.2008 16:24:35:
> Here is an example doing the same type of thing. > It should be easy enough to adapt. > > Good luck > > =========================================================== > x <- runif(100, 0, 1) > y <- runif(100, 0, 1) > z <- data.frame(x,y) > > plot(subset(z, z$y >=.5), col="red", ylim=c(min(z$y), > max(z$y)), pch=16) > points(subset(z, z$y <=.49), col="blue", pch=16) > =========================================================== Or third <- (z$y >=.5)+1 plot(z, col=third, pch=16) Just tell to col a vector of colors with appropriate use of logical. Or you can use col = as.numeric(some factor), which is quite convenient use of factors feature which is not desired in other cases. See warning section of factor help page. Regards > > > --- On Fri, 9/5/08, Steve Murray <[EMAIL PROTECTED]> wrote: > > > From: Steve Murray <[EMAIL PROTECTED]> > > Subject: [R] Use of colour in plots > > To: r-help@r-project.org > > Received: Friday, September 5, 2008, 9:10 AM > > Dear all, > > > > I have 3 datasets all of which share the same longitude and > > latitude values, which I'm looking to plot onto a > > scattergraph. The third dataset has values which can only be > > either '1' or '2'. So to incorporate all > > three datasets onto two axes, I'm wondering if I can > > plot dataset1 and dataset2 as normal, but then use colour to > > determine whether these points are either values '1' > > or '2' according to the third dataset. > > > > If so, how would I go about doing this in R, and what > > format would the command take? > > > > Thanks for any help offered, > > > > Steve > > > > ______________________________________________ > > 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. ______________________________________________ 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.