R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> 
> x <- c(1,1,2,3,4,2,1)
> x <- base::letters[x]
> print(x)
[1] "a" "a" "b" "c" "d" "b" "a"
> 
> # Identify entries with replicated values
> reps <- isReplicated(x)
> print(x[reps])
[1] "a" "a" "b" "b" "a"
> stopifnot(x[reps] == replicates(x))
> 
> # Identify entries with unique values
> print(x[!reps])
[1] "c" "d"
> stopifnot(x[!reps] == singles(x))
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Validation
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> x <- c(1,1,2,3,4,2,1)
> x <- base::letters[x]
> reps <- isReplicated(x)
> 
> stopifnot(all(table(x[reps]) > 1))
> stopifnot(all(table(x[!reps]) == 1))
> stopifnot(all(reps == rev(isReplicated(rev(x)))))
> stopifnot(all(reps == duplicated(x) | duplicated(x, fromLast=TRUE)))
> stopifnot(all(reps == !is.element(x, setdiff(x, unique(x[duplicated(x)])))))
> stopifnot(all(sort(c(singles(x), replicates(x))) == sort(x)))
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Benchmarking singles()
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> set.seed(0xBEEF)
> n <- 1e6
> x <- sample(1:(n/2), size=n, replace=TRUE)
> t <- system.time({
+   s <- isSingle(x)
+ })
> print(sum(s))
[1] 135603
> 
> t0 <- system.time({
+   s0 <- !(x %in% x[duplicated(x)])
+ })
> print(t/t0)
     user    system   elapsed 
1.1250000 0.3333333 1.1000000 
> stopifnot(all(s == s0))
> 
> proc.time()
   user  system elapsed 
   0.64    0.10    0.71