Creating a repeating vector sequence in R [duplica

问题:

This question already has an answer here:

R: generate a repeating sequence based on vector (1 answer)

Closed 2 years ago.

I need some help. How to create the following vector sequence:

1 1 1 1 2 2 2 3 3 4 

I tried to use (rep) and (seq) but still unsucessfull.

回答1:

Try this:

rep(1:4,4:1)

Output:

[1] 1 1 1 1 2 2 2 3 3 4

回答2:

or less concisely: c(rep(1, 4), rep(2,3), rep(3, 2), 4)

output: [1] 1 1 1 1 2 2 2 3 3 4