split_dim {rbmi}

Transform array into list of arrays

Description

Transform an array into list of arrays where the listing is performed on a given dimension.

Usage

split_dim(a, n)

Arguments

a

Array with number of dimensions at least 2.

n

Positive integer. Dimension of a to be listed.

Details

For example, if a is a 3 dimensional array and n = 1, split_dim(a,n) returns a list of 2 dimensional arrays (i.e. a list of matrices) where each element of the list is a[i, , ], where i takes values from 1 to the length of the first dimension of the array.

Example:

inputs: a <- array( c(1,2,3,4,5,6,7,8,9,10,11,12), dim = c(3,2,2)), which means that:

a[1,,]     a[2,,]     a[3,,]

[,1] [,2]  [,1] [,2]  [,1] [,2]
---------  ---------  ---------
 1    7     2    8     3    9
 4    10    5    11    6    12

n <- 1

output of res <- split_dim(a,n) is a list of 3 elements:

res[[1]]   res[[2]]   res[[3]]

[,1] [,2]  [,1] [,2]  [,1] [,2]
---------  ---------  ---------
 1    7     2    8     3    9
 4    10    5    11    6    12

Value

A list of length n of arrays with number of dimensions equal to the number of dimensions of a minus 1.