I have a matrix

a<-c(2,3,4,Inf)

b<-as.matrix(a)

[,1][1,] 2

[2,] 3

[3,] 4

[4,] Inf

range(b, finite=TRUE)[2] (this is the maximum)

[1] 4There is a pre-def function to extract the location (in terms of rows) of

the value in the matrix.

In my example would be

3 (max is in the third row)

The maximum is in the position (row) 3.