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)
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?
Cheers,
dave
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