Check if unique elements of a vector appear in contiguous clusters

ordered.clusters determines if identical elements of a vector appear in contiguous clusters, and returns TRUE if the do and FALSE otherwise.

ordered.clusters(id)

Arguments

id

a vector

Value

The function returns TRUE if the elements appear in contiguous clusters and FALSE otherwise

See also

duplicated

Author

Claus Ekstrom claus@ekstroem.dk with suggestions from Peter Dalgaard.

Examples

x <- c(1, 1, 1, 2, 2, 3, 4, 1, 5, 5, 5)
ordered.clusters(x)
#> [1] FALSE
ordered.clusters(sort(x))
#> [1] TRUE
ordered.clusters(x[order(x)])
#> [1] TRUE