Question

I have some data:

 Length(cm) Frequency
   1          5 
   2          2 
   3          3
   4          5 

Is there a way to expand these numbers in R without typing them out manually, so I can work out the std error of the mean for length, so I have a dataset like:

  1 1 1 1 1 2 2 3 3 3 4 4 4 4 4  

which I can then work on? Thanks

Answer 1

You can use rep.

> l <- 1:4
> f <- c(5,2,3,5)
> rep(l,f)
 [1] 1 1 1 1 1 2 2 3 3 3 4 4 4 4 4