How to repeat elements in list n times?

问题

How do I repeat each element of a list n times and form a new list? For example:

x=[1,2,3,4]
n=3

Looking for:

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

回答1:

An inner argument to repeat is what I was looking for:

repeat([1, 2, 3, 4], inner = 3)

回答2:

Also list comprehension:

x = [1,2,3,4]
n = 3
result = [i for i in x for j in 1:n]

来源：https://stackoverflow.com/questions/60234868/how-to-repeat-elements-in-list-n-times