CODEWITHSUNDEEP
r
John-Henry
John-Henry

Reputation: 1807

How do I add a vector to another holding the first vector constant?

How do I add a vector to another while keeping for the first vector constant? For example if I had c(1, 2, 3) + 1. I would get 2, 3, 4. If I wanted to scale this up to say + 1, and + 2, what could I do to get 

2, 3, 4, 3, 4, 5

Intuitively I wanted to c(1, 2, 3) + c(1, 2) but this does not work.

Upvotes: 0

Views: 39

Answers (1)

markus
markus

Reputation: 26343

Turning the comments into an answer we can use outer as @jogo showed

c(outer(1:3, 1:2, FUN='+'))
# [1] 2 3 4 3 4 5

Another option is rep

f <- function(x, y) {
  x + rep(y, each = length(x))
}

f(1:3, 1:2)
# [1] 2 3 4 3 4 5

Upvotes: 1

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