How to create a faceted line-graph using ggplot?

Question

I have a data frame created with this code:

require(reshape2)
foo <- data.frame( abs( cbind(rnorm(3),rnorm(3, mean=.8),rnorm(3, mean=.9),rnorm(3, mean=1))))
q         


        

Answer 1

Even it is a ggplot2 is required by the OP , but I think this example is suitable for lattice also:

library(lattice)
xyplot(data=alldf.m, value~variable|fn, type ='b', groups = ID, auto.key = T)

and using latticeExtra we can get something colse to ggplot2 solution:

 p <-  xyplot(data=alldf.m, value~variable|fn, type ='b', groups = ID, auto.key = T)
 update(p , par.settings = ggplot2like())