iapply: Array/Apply Iterator

Description Usage Arguments Value See Also Examples

View source: R/iapply.R

Description

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

Usage

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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

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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 29, 2017, 9:09 p.m.