[R] vectorized lines

[Uwe Ligges]

Mikkel Grum wrote:

> Hi,
> 
> I thought that the following code would give me a set
> of parallel lines on a plot as in the second example.
> 
> q<-c(-2253,-2119,-1985,-1850)
> p<-c(1,2,3,4)
> a<-rep(min(p),4)
> b<-rep(max(p),4)
> plot(p,q)
> 
> # example 1
> lines(c(a,b),c(q,q))
> 
> Now this gives me the lines I really want:
> 
> # example 2
> lines(c(a[1],b[1]),c(q[1],q[1]))
> lines(c(a[2],b[2]),c(q[2],q[2]))
> lines(c(a[3],b[3]),c(q[3],q[3]))
> lines(c(a[4],b[4]),c(q[4],q[4]))
> 
> I assumed that example 1 was a shorter (vectorized)
> way of writing example 2?? What have I got wrong?

See ?segments

Uwe Ligges


> cheers,
> Mikkel
> 
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