Re: [R] Progress in a loop

From: Gavin Simpson <>
Date: Thu 20 Jul 2006 - 00:31:35 EST

On Wed, 2006-07-19 at 16:12 +0200, Florent Bresson wrote:
> Hi, I have to use a loop to perform a quite computer
> intensive estimation and I would like to know the
> progress of the loop during the process. I tried to
> include something like
> print(paste(k,date(),sep=" : "))
> where k is the number of the iteration, but the result
> appears only at the end of the loop. Can someone help
> me please ?

Windows I assume - you are asked to provide some rudimentary information about your system when asking for help as the posting guide states.

You need to use flush.console() on Windows, as in:

dat <- matrix(runif(20), ncol = 2)
res <- numeric(length = 10)
for(i in 1:10) {

   res[i] <- sum(dat[i, ])
   cat(paste("Iteration #:", i, "-", date(), "\n"))    flush.console()

Depending on how you want the printed statements to appear on the screen, you'd be better off with cat not print, e.g.:

cat(paste(k,date(),sep=" : "))

If this isn't the solution, post a reply containing information about your R version, OS, and a reproducible example (simple code & data as I did) to show us the problem.


 Gavin Simpson                 [t] +44 (0)20 7679 0522
 ECRC & ENSIS, UCL Geography,  [f] +44 (0)20 7679 0565
 Pearson Building,             [e]
 Gower Street, London          [w]
 UK. WC1E 6BT.                 [w]

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Received on Thu Jul 20 00:45:40 2006

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