grouping by two factors (geom_line)

[Christian Rummey]

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()

[Winston Chang]

You can use interaction(), like this:

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

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[Christian Rummey]

Winston - that did the trick.
thanks a lot!
Christian

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[Tushar Garg]

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

Thanks

Tushar