R: Find the index of first/last 'TRUE' value in a logical...

which.first {BBmisc}

R Documentation

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

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

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

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

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

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

which.first(c(FALSE, TRUE))

## [1] 2

 which.last(c(FALSE, FALSE))

## integer(0)

[Package BBmisc version 1.7 Index]