# mapply

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

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.

Keywords
manip, utilities
##### 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.

##### 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.

• mapply
##### Examples
library(base) 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 package base, version 3.4.1, License: Part of R 3.4.1

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