grouping by two factors (geom_line)

[Tushar Garg]

How can I give some name to a combination of factors.

Thanks
Tushar

mtcars$gear = factor(mtcars$gear)
mtcars$carb = factor(mtcars$carb)
ggplot(mtcars, aes(x=hp, y=disp, shape=gear, colour=carb)) +
geom_point() +
geom_line(aes(group=interaction(carb,gear)))
-Winston

dear all!
I have data grouped by two factors, let's say gear and carb (see below).
To connect the points per group, I can either use
group=carb
OR
group=gear
But what I need is something like group=c(carb + gear) to connect only
the dots that have *both* factors in common.
I could create a new column, but there must be another way to do this...
Many thanks
- Christian
mtcars$gear = factor(mtcars$gear)
mtcars$carb = factor(mtcars$carb)
ggplot(mtcars) +
aes(hp,disp)+
aes(shape = gear) +
aes(color = carb) +
aes(group=carb) +
geom_point()+
geom_line()
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