Generate a repeating sequence

Question

I need to generate a vector of the following format using R:

1:10, 1:10, 11:20, 11:20, ... 121:130, 121:130

Is there an easier way than cre

Answer 1

Another way:

x <- matrix(1:130, 10, 13)
c(rbind(x, x))

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Possible more efficient version:

x <- 1:130
dim(x) <- c(10,13)
c(rbind(x, x))