Finding row index containing maximum value using R

Question

Given the following matrix lets assume I want to find the maximum value in column two:

mat <- matrix(c(1:3,7:9,4:6), byrow = T, nc = 3)
mat
     [,1] [,2]         


        

Answer 1

See ?which.max

> which.max( matrix[,2] )
[1] 2