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A comment on The R language, for programmers. Parent comment
> s2 <- data.frame(x=c(1,2,3,4), y=c(6,7,6,7), series=rep("s2", 4))
> s <- rbind(s1, s2)
> qplot(x, y, data=s, geom=c('point', 'line'), color=series)
> s2 <- data.frame(x=c(1,2,3,4), y=c(6,7,6,7), series=rep("s2", 4))
> s <- rbind(s1, s2)
> qplot(x, y, data=s, geom=c('point', 'line'), color=series)