Hi Dave, On Mon, Nov 17, 2008 at 6:35 AM, Dave Murray-Rust <[EMAIL PROTECTED]> wrote: > I'm trying to plot multiple lines using different colours/symbols to > distinguish them. If I try to plot more than 6 lines, I get an error: > >> ggplot( dat, aes(x=time,y=value,group=variable,shape=variable) ) + >> geom_line() > Error: scale_shape can deal with a maximum of 6 discrete values, but you > have 9. See ?scale_manual for a possible alternative > > I find this slightly confusing, as there are ~25 symbols listed for use. > (I'm using ggplot2 0.7, on OSX, R 2.7.2)
But distinguishing between more than 6 of is very difficult! > Ideally, I'd like to use a combination of colours and symbols (e.g. 5 > colours and 4 symbols -> 20 unique possibilities) or even colours, symbols > and linetypes - is there a way to do this in ggplot2? Unfortunately not - this type of combined scale is on my to do list, but I haven't got around to it yet. Here's a work around: df <- data.frame(a = 1:20, b = 1:20, c = letters[1:20]) qplot(a, b, data = df, colour = c) df$d <- factor(rep(1:5, each = 4)) df$e <- factor(rep(1:4, by = 5)) qplot(a, b, data = df, colour = d, shape = e) Generally, I'd wouldn't advise splitting up a single variable across two aesthetics like this: perceptually I don't think its a great idea. Regards, Hadley -- http://had.co.nz/ ______________________________________________ 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.
