[R] Listing object sizes without RODBC objects: contributed function

[Leif Kirschenbaum]

I include my workaround for object.size failing on RODBC objects.
Code adapted from Petr Pikal's code (http://tolstoy.newcastle.edu.au/R/help/04/06/1228.html).

ls.objects<-function (pos = 1, order.by,...)
{
    napply <- function(names, fn) sapply(names, function(x) fn(get(x,pos=pos)))
    names <- ls(pos = pos,...)
    obj.class <- napply(names, function(x) as.character(class(x))[1])
    obj.drop <- match("RODBC",obj.class)
    obj.class <- obj.class[-obj.drop]
    names <- names[-obj.drop]
    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
} 


Leif S. Kirschenbaum, Ph.D.
Senior Yield Engineer
Reflectivity, Inc.