# mapply {base}

### 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

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.

### Values

A list, or for `SIMPLIFY = TRUE`

, a vector, array or list.

### See Also

`sapply`

, after which `mapply()`

is modelled.

`outer`

, which applies a vectorized function to all combinations of two arguments.

### Examples

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))

Documentation reproduced from R 3.0.2. License: GPL-2.