rnorm function in R - Usage

Question

I understand the normal usage of rnorm (pardon the pun)

rnorm(n, mean = 0, sd = 1)

However, I came across the code below and I am not sure what the 2nd input array does as the mean.

y <- rnorm(12, rep(c(1,2,1), each=4),0.2)

Answer 1

y = rnorm(12, rep(c(1,2,1), each=4, 0.2))
I can explain this in the following way:

Create four normal random variables with mean 1 and standard deviation 0.2.
Create four normal random variables with mean 2 and standard deviation 0.2.
Create four normal random variables with mean 1 and standard deviation 0.2.
You can accomplish this in a single line rather than having to write a for loop or multiple pieces of code. That is what makes R sweet.

The code you see above is that. In a single line, all three claims.

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