purrr: reduce_right – R documentation

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purrr

reduce_right

Reduce from the right (retired)

Description

Soft-deprecated lifecycle

These functions are retired as of purrr 0.3.0. Please use the .dir argument of reduce() instead, or reverse your vectors and use a left reduction.

Usage

reduce_right(.x, .f, ..., .init)

reduce2_right(.x, .y, .f, ..., .init)

accumulate_right(.x, .f, ..., .init)

Arguments

`.x`	A list or atomic vector.
`.f`	For `reduce()`, and `accumulate()`, a 2-argument function. The function will be passed the accumulated value as the first argument and the "next" value as the second argument. For `reduce2()` and `accumulate2()`, a 3-argument function. The function will be passed the accumulated value as the first argument, the next value of `.x` as the second argument, and the next value of `.y` as the third argument. The reduction terminates early if `.f` returns a value wrapped in a `done()`.
`...`	Additional arguments passed on to the mapped function.
`.init`	If supplied, will be used as the first value to start the accumulation, rather than using `.x[[1]]`. This is useful if you want to ensure that `reduce` returns a correct value when `.x` is empty. If missing, and `.x` is empty, will throw an error.
`.y`	For `reduce2()` and `accumulate2()`, an additional argument that is passed to `.f`. If `init` is not set, `.y` should be 1 element shorter than `.x`.

purrr

Functional Programming Tools

v0.3.4

GPL-3 | file LICENSE

Authors

Lionel Henry [aut, cre], Hadley Wickham [aut], RStudio [cph, fnd]

Initial release

reduce_right

Description

Usage

Arguments

purrr

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