Follow-up Q Re: [R] displaying computation outputs inside "for" loops
Dave Atkins
datkins at u.washington.edu
Mon Aug 9 18:51:27 CEST 2004
I have now been enlightened via Windows FAQ 6.2 on "When using Rgui the output
to the console seems to be delayed." Ctrl-W toggles whether console output is
buffered.
[As a side note: Damn! I was hoping to avoid that response (i.e., having my
ignorance pointed out), but all my searches of R-help and FAQs had focused on
"for()" and "iteration," which didn't find the right answer. Knowing the
"right" question to ask goes a long way...]
Thanks, Dave
Prof Brian Ripley wrote:
> On Mon, 9 Aug 2004, Dave Atkins wrote:
>
>
>>I have a somewhat related question. A while back I was doing some simulations
>>using for() loops, and I wanted to keep track of the iterations using a line of
>>code quite similar to what Dimitris presented below. Instead of printing the
>>iteration message at the end of each iteration (actually, at the end of every
>>100th), nothing was printed until the for() loop was complete, and *then* all
>>the iteration messages were reported. Extending Dimitris' example:
>>
>>for(i in 1:10000){
>> x <- rnorm(5)
>> cat("the values of `x' are:", format(x), "\n")
>> cat("computation", i, "finished\n\n")
>>}
>>
>>demonstrates what I'm referring to (using R v1.9.1 with Windows XP): Iterations
>>are not printed as they occur, only at the end of the for() loop computation.
>
>
> This *is* in the rw-FAQ. Please see the posting guide.
>
>
>>An interesting wrinkle is that I sometimes use Emacs (and ESS). Running the
>>code from within Emacs prints the iterations as they occur; also, if I switch to
>>other programs and then back to R, iterations have been printed.
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