[R] problem in finding sizes of objects using a for loop

[David Winsemius]

On Oct 25, 2012, at 10:56 AM, jim holtman wrote:

> Here is a function I use to get the size of objects:
> 
> Here is an example output:
> 
>> my.ls()
>                     Size     Mode
> allStores       7,303,224     list
> convertedStores         0     NULL
> f.createCluster    40,508 function
> x                  41,672     list
> **Total         7,385,404  -------

That's far more elegant that the one I use; 

getsizes <-  function() {z <- sapply(ls(envir=globalenv()), 
                                function(x) object.size(get(x)))
               (tmp <- as.matrix(rev(sort(z))[1:10]))}
getsizes()

Only returns the sorted-by-size matrix of the largest ten objects, but modifying it to return all of them should be trivial.

-- 
david.


> 
> 
> my.ls <- function (pos = 1, sorted = FALSE, envir = as.environment(pos))
> {
>    .result <- sapply(ls(envir = envir, all.names = TRUE),
> function(..x) object.size(eval(as.symbol(..x),
>        envir = envir)))
>    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),
>        envir = envir)))), "-------")
>    .ls
> }
> 
> 
> On Thu, Oct 25, 2012 at 2:24 AM, Purna chander <chanderbio at gmail.com> wrote:
>> Dear All,
>> 
>> I wanted to extract the sizes of all created objects. For E.g when I
>> created 2 objects(x and y), I got their sizes using the following
>> code:
>> 
>>> x<-rnorm(10000)
>>> y<-runif(100,min=40,max=1000)
>>> ls()
>> [1] "x" "y"
>>> object.size(x)
>> 80024 bytes
>>> object.size(y)
>> 824 bytes
>> 
>> However, I was unable to get their sizes when I used a for loop in the
>> following way:
>> 
>>> objects<-ls()
>>> for (i in seq_along(objects)){
>> +   print(c(objects[i],object.size(objects[i])))
>> +
>> + }
>> [1] "x"  "64"
>> [1] "y"  "64"
>> 
>> 
>> The result obtained by me is wrong in second case.
>> 
>> I understood that variables x and y are treated as characters. But to
>> rectify this problem.
>> 
>> Regards,
>> Purna
>> 
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> 
> 
> 
> -- 
> Jim Holtman
> Data Munger Guru
> 
> What is the problem that you are trying to solve?
> Tell me what you want to do, not how you want to do it.
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
Alameda, CA, USA