# mapply: Apply a Function to Multiple List or Vector Arguments

## Description

`mapply` is a multivariate version of `sapply`. `mapply` applies `FUN` to the first elements of each ... argument, the second elements, the third elements, and so on. Arguments are recycled if necessary.

## Usage

 ```1 2``` ```mapply(FUN, ..., MoreArgs = NULL, SIMPLIFY = TRUE, USE.NAMES = TRUE) ```

## Arguments

 `FUN` function to apply, found via `match.fun`. `...` arguments to vectorize over (vectors or lists of strictly positive length, or all of zero length). See also ‘Details’. `MoreArgs` a list of other arguments to `FUN`. `SIMPLIFY` logical or character string; attempt to reduce the result to a vector, matrix or higher dimensional array; see the `simplify` argument of `sapply`. `USE.NAMES` logical; use names if the first ... argument has names, or if it is a character vector, use that character vector as the names.

## Details

`mapply` calls `FUN` for the values of `...` (re-cycled to the length of the longest, unless any have length zero), followed by the arguments given in `MoreArgs`. The arguments in the call will be named if `...` or `MoreArgs` are named.

Arguments with classes in `...` will be accepted, and their subsetting and `length` methods will be used.

## Value

A list, or for `SIMPLIFY = TRUE`, a vector, array or list.

`sapply`, after which `mapply()` is modelled.
`outer`, which applies a vectorized function to all combinations of two arguments.
 ``` 1 2 3 4 5 6 7 8 9 10 11 12``` ```mapply(rep, 1:4, 4:1) mapply(rep, times = 1:4, x = 4:1) mapply(rep, times = 1:4, MoreArgs = list(x = 42)) mapply(function(x, y) seq_len(x) + y, c(a = 1, b = 2, c = 3), # names from first c(A = 10, B = 0, C = -10)) word <- function(C, k) paste(rep.int(C, k), collapse = "") utils::str(mapply(word, LETTERS[1:6], 6:1, SIMPLIFY = FALSE)) ```