[R] Variable scoping question

[jim holtman]

Here is a function I use to look at the sizes of objects:

my.ls <-
function (pos = 1, sorted = FALSE)
{
    .result <- sapply(ls(pos = pos, all.names = TRUE), function(..x)
object.size(eval(as.symbol(..x))))
    if (sorted) {
        .result <- rev(sort(.result))
    }
    .ls <- as.data.frame(rbind(as.matrix(.result), `**Total` = sum(.result)))
    names(.ls) <- "Size"
    .ls$Size <- formatC(.ls$Size, big.mark = ",", digits = 0,
        format = "f")
    .ls$Mode <- c(unlist(lapply(rownames(.ls)[-nrow(.ls)], function(x)
mode(eval(as.symbol(x))))),
        "-------")
    .ls
}



On Thu, Sep 8, 2011 at 9:13 AM, Bos, Roger <roger.bos at rothschild.com> wrote:
> I modified an example in the object.size help page to create a function
> I want to be able to run:
>
> "mysize" <- function() {
>    z <- sapply(ls(), function(w) object.size(get(w)))
>    as.matrix(rev(sort(z))[1:5])
> }
> mysize()
>
> When I test the lines inside the function it works fine:
>
>>     z <- sapply(ls(), function(w) object.size(get(w)))
>
>>     as.matrix(rev(sort(z))[1:5])
>             [,1]
> mat     166344288
> mod     130794704
> zidx       799664
> wfidx      799664
> megacap    799664
>>
>
> But when I try to run the function, it produces an error:
>
>> "mysize" <- function() {
> +     z <- sapply(ls(), function(w) object.size(get(w)))
> +     as.matrix(rev(sort(z))[1:5])
> + }
>
>> mysize()
> Error in rev(sort(z)) :
>  error in evaluating the argument 'x' in selecting a method for
> function 'rev': Error in sort.int(x, na.last = na.last, decreasing =
> decreasing, ...) :
>  'x' must be atomic
>>
>
> It must be a variable scoping problem, but I am not sure how to tackle
> it.
>
> Thanks,
>
> Roger
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>
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-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?