将向量的每个元素添加到另一个向量

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

Answer 3

You can also use variations of rep with + :

rep(x, length(y)) + rep(y, each=length(x))
[1] 3 3 6 4 4 7

The second argument to + uses the each argument to rep which repeats each element of y corresponding to the length of x.

Answer 4

或者您可以尝试：

as.vector(sapply(y,function(i) (i+x)))