Hi all, I have been using ggplot for a few months and ran into this
porblem, I am trying to use ggplot in a for loop and it is not working. if
I do the following:
 data=as.data.frame(cbind(rnorm(10),rnorm(10),rnorm(10)))
############
pp=ggplot(data, aes(x=(1:10), y=data[,1]))
pp=pp+geom_line(aes(x=(1:10),y = data[,1]),lty=2)
pp=pp+geom_line(aes(x=(1:10),y = data[,2]),lty=2)
pp=pp+geom_line(aes(x=(1:10),y = data[,3]),lty=2)
print(pp)
############
I get what I want, all 3 lines on the plot,

but this does NOT work:
###################
pp=ggplot(data, aes(x=(1:10), y=data[,1]))
for(i in 1:3){
pp=pp+geom_line(aes(x=(1:10),y = data[,i]),lty=2)
}
print(pp)
################
this does not work...

I know I can do it using the group varable, but I would like to use for
loops sometimes and want to know if you can do it.

thank, Tarek

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