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
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
>
> ______________________________________________
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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.
>
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
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