iapply: Array/Apply Iterator

In iterators: Provides Iterator Construct

Description

Returns an iterator over an array, which iterates over the array in much the same manner as the apply function.

Usage

iapply(X, MARGIN)

Arguments

X	the array to iterate over.
MARGIN	a vector of subscripts. 1 indicates the first dimension (rows), 2 indicates the second dimension (columns), etc.

Value

The apply iterator.

See Also

apply

Examples

a <- array(1:8, c(2, 2, 2))

# iterate over all the matrices
it <- iapply(a, 3)
as.list(it)

# iterate over all the columns of all the matrices
it <- iapply(a, c(2, 3))
as.list(it)

# iterate over all the rows of all the matrices
it <- iapply(a, c(1, 3))
as.list(it)

Example output

[[1]]
     [,1] [,2]
[1,]    1    3
[2,]    2    4

[[2]]
     [,1] [,2]
[1,]    5    7
[2,]    6    8

[[1]]
[1] 1 2

[[2]]
[1] 3 4

[[3]]
[1] 5 6

[[4]]
[1] 7 8

[[1]]
[1] 1 3

[[2]]
[1] 2 4

[[3]]
[1] 5 7

[[4]]
[1] 6 8

iterators documentation built on May 2, 2019, 5:17 p.m.