[R] complexity of operations in R

[Bert Gunter]

Hadley et. al:

Indeed. And using a loop is a poor way to do it anyway.

v <- as.list(rep(FALSE,dotot))

is way faster.

-- Bert

On Thu, Jul 19, 2012 at 8:50 AM, Hadley Wickham <hadley at rice.edu> wrote:
> On Thu, Jul 19, 2012 at 8:02 AM, Jan van der Laan <rhelp at eoos.dds.nl> wrote:
>> Johan,
>>
>> Your 'list' and 'array doubling' code can be written much more efficient.
>>
>> The following function is faster than your g and easier to read:
>>
>> g2 <- function(dotot) {
>>   v <- list()
>>   for (i in seq_len(dotot)) {
>>     v[[i]] <- FALSE
>>   }
>> }
>
> Except that you don't need to pre-allocate lists...
>
> Hadley
>
> --
> Assistant Professor / Dobelman Family Junior Chair
> Department of Statistics / Rice University
> http://had.co.nz/
>
> ______________________________________________
> 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.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm