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On 02/16/2011 03:29 PM, Hadley Wickham wrote:
> One way to implement this functionality is with a task manager callback:
>
> watch <- function(varname) {
> old <- get(varname)
>
> changed <- function(...) {
> new <- get(varname)
> if (!identical(old, new)) {
> message(varname, " is now ", new)
> old <<- new
> }
> TRUE
> }
> invisible(addTaskCallback(changed))
> }
>
> a <- 1
> watch("a")
> a <- 2
Wow - I was looking for something like that for a long time - this is
absolutely perfect for debugging. I guess I will use it quite often.
Thanks,
Rainer
>
>
> Hadley
>
> On Wed, Feb 16, 2011 at 9:38 AM, Alaios <ala...@yahoo.com> wrote:
>> Dear all I would like to ask you if there is a way in R to monitor in R when
>> a value changes.
>>
>> Right now I use the sprintf('my variables is %d \n, j) to print the value of
>> the variable.
>>
>> Is it possible when a 'big' for loop executes to open in a new window to
>> dynamically check only the variable I want to.
>>
>> If I put all the sprintf statements inside my loop then I get flooded with
>> so many messages that makes it useless.
>>
>> Best Regards
>> Alex
>>
>> ______________________________________________
>> R-help@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.
>>
>
>
>
- --
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)
Centre of Excellence for Invasion Biology
Natural Sciences Building
Office Suite 2039
Stellenbosch University
Main Campus, Merriman Avenue
Stellenbosch
South Africa
Tel: +33 - (0)9 53 10 27 44
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email: rai...@krugs.de
Skype: RMkrug
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
