Reorder Factor Variables in R

Question

Thanks for the help!

I want the vector of:

s = c(2, 2, 2, 4, 4, 3, 5, 1)

to be

s = c(1, 1, 1, 2, 2, 3, 4, 5).

I am not sorting!

Answer 1

Using rleid

data.table::rleid(s)
[1] 1 1 1 2 2 3 4 5

Answer 2

In base R

cumsum(c(TRUE, diff(s) != 0))
#[1] 1 1 1 2 2 3 4 5

Answer 3

Use rle and inverse.rle from the base R.

s <- c(2, 2, 2, 4, 4, 3, 5, 1)

rl <- rle(s)
rl$values <- sort(unique(s))
s <- inverse.rle(rl)

s
# [1] 1 1 1 2 2 3 4 5