Add each element of vector to another vector

Question

I have 2 vectors

x <- c(2,2,5)
y <- c(1,2)

I want to add each element of the vectors together to get

[1] 3 3 6 4 4 7

How can I do this?

Answer 1

We can use outer with FUN as +

c(outer(x, y, `+`))
#[1] 3 3 6 4 4 7

Answer 2

You can try creating each pair of x/y elements with expand.grid and then computing the row sums:

rowSums(expand.grid(x, y))
# [1] 3 3 6 4 4 7