R/lsos.R

In BelindaYu/knitr.timing:

## Modified version of Dirk's impoved ls()
## function and shortcut
## (http://stackoverflow.com/questions/1358003/tricks-to-manage-the-available-memory-in-an-r-session)
## improved list of objects
## from: https://gist.githubusercontent.com/PeteHaitch/8929540/raw/64e6d1181d28da63025d9de7ed4f848718d53bae/lsos.R
.ls.objects <- function (pos = 1, pattern, order.by,
                         decreasing=FALSE, head=FALSE, n=5) {
  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.prettysize <- napply(names, function(x) {
    capture.output(print(object.size(x), units = "auto")) })
  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.prettysize, obj.dim)
  names(out) <- c("Type", "Size", "PrettySize", "Rows", "Columns")
  if (!missing(order.by))
    out <- out[order(out[[order.by]], decreasing=decreasing), ]
  if (head)
    out <- head(out, n)
  out
}

#' Show the size of objects.
#' @param n number of objects to show.
#' @examples
#' lsos()
#' @export
lsos <- function(..., n=10) {
  .ls.objects(..., order.by="Size", decreasing=TRUE, head=TRUE, n=n)
}