#' @family array input
#' @section Input: This function splits matrices, arrays and data frames by
#' dimensions
#'
#' @param .data matrix, array or data frame to be processed
#' @param .margins a vector giving the subscripts to split up \code{data} by.
#' 1 splits up by rows, 2 by columns and c(1,2) by rows and columns, and so
#' on for higher dimensions
#' @param .expand if \code{.data} is a data frame, should output be 1d (expand
#' = FALSE), with an element for each row; or nd (expand = TRUE), with a
#' dimension for each variable.
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