# from Rhelp, 8-2-2016, Peter Pikal
# Long time ago I (with some help from R help list) made following function, which is maybe less
# comprehensive as ls.str but I find it quite handy.
#' ls with added information on objects
#'
#' \code{ls} with added information on object Type, Size, Rows, and Columns
#'
#' @param pos position in the search list
#' @param pattern an optional regular expression. Only names matching pattern are returned.
#' @param order.by one of \code{"Type"}, \code{"Size"}, \code{"Rows"}, \code{"Columns"}
#'
#' @return a data frame, with columns Type, Size, Rows, Columns. Object names are the row names.
#' @export
#' @source Peter Pikal, from R-help 8-2-2016
#' @importFrom utils object.size
#'
#' @examples
#' ls.objects()
#' ls.objects(pattern="*lm")
#' ls.objects(order.by="Type")
ls.objects <- function (pos = 1, pattern, order.by)
{
napply <- function(names, fn) sapply(names, function(x) fn(get(x,
pos = pos)))
names <- ls(pos = pos, pattern = pattern)
obj.class <- napply(names, function(x) as.character(class(x))[1])
obj.mode <- napply(names, mode)
obj.type <- ifelse(is.na(obj.class), obj.mode, obj.class)
obj.size <- napply(names, object.size)
obj.dim <- t(napply(names, function(x) as.numeric(dim(x))[1:2]))
vec <- is.na(obj.dim)[, 1] & (obj.type != "function")
obj.dim[vec, 1] <- napply(names, length)[vec]
out <- data.frame(obj.type, obj.size, obj.dim)
names(out) <- c("Type", "Size", "Rows", "Columns")
if (!missing(order.by))
out <- out[order(out[[order.by]]), ]
out
}
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