How to identify coordinates in R

Question

I would like to identify which coordinate of my vector gives me the greatest value. For a simple example suppose that:

x <- c(10,22,20,18,5)

Answer 1

which.max is your friend as pointed out by @Hong Ooi

> x <- c(10,22,20,18,5)
> which.max(x)
[1] 2

Another (not optimal way) is a combination of which and max.

> which(x==max(x))
[1] 2