I am trying add geom_line's using a loop but the nature of unevaluated
parameters is causing me problems.
This code works:
ex <- function() {
d <- data.frame(x=1:5,a=1:5,b=2:6,c=3:7)
g <- ggplot(d, aes(x))
g <- g +
geom_line(aes(y=a,colour=a)) +
geom_line(aes(y=b,colour=b)) +
geom_line(aes(y=c,colour=c))
return(g)
}
This code (not surprisingly) fails:
ex2 <- function() {
d <- data.frame(x=1:5,a=1:5,b=2:6,c=3:7)
g <- ggplot(d, aes(x))
for (n in c("a","b","c")) {
g <- g + geom_line(aes(y=n,colour=n))
}
return(g)
}
I believe i want something like the failing code, but done right.
I have two problems (at least in this code):
#1 how do handle the parameter evaluation
#2 is this the right thing to be even doing with geom_line() & aes() ?
Geoff.
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