Thanks A.K. and Jeff, both answers helped me. (and of course gave me more homework!)
On 31/12/13 16:04, Jeff Newmiller wrote:
A.K. answered your question 1, but since you did say as question 2 that you wanted it done right... library(reshape2) ex3 <- function() { d <- data.frame(x=1:5,a=1:5,b=2:6,c=3:7) dl <- melt( d, id.vars="x" ) ggplot(dl,aes(x=x,y=value,color=variable))+ geom_line() } --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<[email protected]> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity. arun <[email protected]> wrote:Hi, Try: 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_string(y=n,colour=n)) } return(g) } A.K. On Monday, December 30, 2013 7:49 PM, Geoffrey <[email protected]> wrote: 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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