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

Alternatively, you could use a combination of rep and outer, such as:

c(outer(1:10,rep(0:12,each=2),function(x,y)10*y+x))