#' list memory-resident objects by footprint
#'
#' @param ... optional arguments to pass on to .ls.objects()
#' @param n optional integer specifying how many to show (default is 10)
#'
#' @return a pretty-printed list of objects and their sizes
#'
#' @export
#'
lsos <- function(n=10, ...) {
.ls.objects(order.by="Size", decreasing=TRUE, head=TRUE, n=n)
}
.ls.objects <- function(pos=1, pattern="", order.by, decreasing=F, head=F, 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.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]], decreasing=decreasing), ]
if (head == TRUE) out <- head(out, n)
return(out)
}
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