which.first {BBmisc}

R Documentation

Find the index of first/last TRUE value in a logical vector.

Description

Find the index of first/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))
 which.last(c(FALSE, FALSE))

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