#' Convert data.frame to various format
#'
#' Convert data.frame to various format like matrix, vector
#'
#' @param .data
#' A tbl.
#'
#' @return
#' An object (matrix, vector etc.).
#' @name convert
NULL
#' @rdname convert
#' @export
to_matrix <- function(.data)
{
apply_preprocessing_with_all_cols(.data, to_matrix_)
}
to_matrix_ <- function(x, arg=NULL, param=NULL)
{
new_preprocessing(as.matrix(x), to_matrix_, param, arg)
}
#' @rdname convert
#' @export
to_vector <- function(.data)
{
c(unlist(.data))
}
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