Array/Apply Iterator

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

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)
#> [[1]]
#>      [,1] [,2]
#> [1,]    1    3
#> [2,]    2    4
#> 
#> [[2]]
#>      [,1] [,2]
#> [1,]    5    7
#> [2,]    6    8
#> 

# iterate over all the columns of all the matrices
it <- iapply(a, c(2, 3))
as.list(it)
#> [[1]]
#> [1] 1 2
#> 
#> [[2]]
#> [1] 3 4
#> 
#> [[3]]
#> [1] 5 6
#> 
#> [[4]]
#> [1] 7 8
#> 

# iterate over all the rows of all the matrices
it <- iapply(a, c(1, 3))
as.list(it)
#> [[1]]
#> [1] 1 3
#> 
#> [[2]]
#> [1] 2 4
#> 
#> [[3]]
#> [1] 5 7
#> 
#> [[4]]
#> [1] 6 8
#>