Finding the maximum value for each row among 3 columns in R

Question

I need to calculate the maximum value for each row among 3 columns.

A table could be:

x = c(1,2,3,4,5 ) 
y = c(2,3,3,1,1 ) 
z = c(4,3,2,1,1 ) 
df<         


        

Answer 1

Use data.table :)

library(data.table)
x = c(1,2,3,4,5 ) 
y = c(2,3,3,1,1 ) 
z = c(4,3,2,1,1 ) 
dt<-data.table(x,y,z)
dt[, max:=pmax(x,y,z)]
dt