r - Plot different parts of a vector with different colors on the same graph

Question

As from the title suppose this vector and plot:

plot(rnorm(200,5,2),type="l")

This returns this plot

What i would like to know is whether there is a way to make the first half of it to be in blue col="blue" and the rest of it to be in red "col="red".

Similar question BUT in Matlab not R: Here

Answer 1

You could simply use lines for the second half:

dat <- rnorm(200, 5, 2)
plot(1:100, dat[1:100], col = "blue", type = "l", xlim = c(0, 200), ylim = c(min(dat), max(dat)))
lines(101:200, dat[101:200], col = "red")