> And if lattice is ok then try this:
>
> library(lattice)
> xyplot(Consumption ~ Quarter, group = Year, data, type = "o")
Or you can use ggplot:
install.packages("ggplot")
library(ggplot)
qplot(Quarter, Consumption, data=data,type=c("point","line"), id=data$Year)
Unfortunately this has uncovered a couple of small bugs for me to fix
(no automatic legend, and have to specify the data frame explicitly)
The slighly more verbose example below shows you what it should look like.
data$Year <- factor(data$Year)
p <- ggplot(data, aes=list(x=Quarter, y=Consumption, id=Year, colour=Year))
ggline(ggpoint(p), size=2)
Regards,
Hadley
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