[R] Scaling Data

[Mathias Ditzen]

Sorry to bother you with such a question. I'm new to R and have tried to 
figure it out myself for a while, but well.
How can I change the scaling of the axis?
If for example I have:

a<-1:30
plot(a,type="b")

The axis is scaled from 1 to 30.

plot(a,xlim=c(1,3))

Just shows me the first three entries of a, but not all 30 scaled from 1 
to 3 with 0.1 ticks.

I guess there must be an easy way to do this, but can't find it.
Thanks for your help,
Mathias from Berlin

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