checkmate: wf – R documentation

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wf

Get the index of the first/last TRUE

A quick C implementation for “which.first” (head(which(x), 1)) and “which.last” (tail(which(x), 1)).

wf(x, use.names = TRUE)

wl(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. NAs are ignored.

wf(c(FALSE, TRUE))
wl(c(FALSE, FALSE))
wf(NA)

Fast and Versatile Argument Checks

v2.0.0

BSD_3_clause + file LICENSE

Authors

Michel Lang [cre, aut] (<https://orcid.org/0000-0001-9754-0393>), Bernd Bischl [ctb]

Initial release