Find the index of first/last TRUE value in a logical vector — which.first • BBmisc

Returns the index of the first or last TRUE value in a logical vector.

Usage

which.first(x, use.names = TRUE)

which.last(x, use.names = TRUE)

Arguments

x: [logical]
Logical vector.
use.names: [logical(1)]
If TRUE and x is named, the result is also named.

Value

[integer(1) | integer(0)]. Returns the index of the first/last TRUE value in x or an empty integer vector if none is found.

Examples

 which.first(c(FALSE, TRUE))
#> [1] 2
 which.last(c(FALSE, FALSE))
#> integer(0)