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

If John posts accept his, but just to show the result his comment does work

x = c(1,2,3,4,5 ) 
y = c(2,3,3,1,1 ) 
z = c(4,3,2,1,1 ) 
df<-data.frame(x,y,z)

df$max<-apply(df, 1, max)
df$max
#[1] 4 3 3 4 5


df
#x y z max
#1 2 4   4
#2 3 3   3
#3 3 2   3
#4 1 1   4
#5 1 1   5