R devel - Jan 2005 - print() from within a function - Windows specific? (PR#7584)

Full_Name: Markus Liedgens
Version: Ever since 1.6
OS: Windows 98 / Windows Xp
Submission from: (NULL) (81.63.111.226)


To control the progress of a function one can consider to use print() to issue a
message in the command window. However, using Win98 / R 1.9 or WinXP / R 2.0,
this approach is of little usefulness, since all the print() commands are issued
at once, just before the control returns to the command window. A test code
could be:

for(i in 1:10){
 for(j in 1:1000){
  for(k in 1:1000){}
 }
 print(i)
}

I once ask a linux / unix user and he was not able to reproduce the problem.

Best regards

-------------------------------------------------
Markus Liedgens
Institut f?r Pflanzenwissenschaften - ETH Z?rich
FEL Eschikon 33
8315 Lidau, Switzerland
e-mail: markus.liedgens@ipw.agrl.ethz.ch
--------------------------------------------------
8315 Lindau

Please read the rw-FAQ, Q6.3. for a discussion to this very useful 
*feature*.

It has been in the FAQ since before 1.0.0.

On Fri, 28 Jan 2005 markus.liedgens@ipw.agrl.ethz.ch wrote:
> Full_Name: Markus Liedgens
> Version: Ever since 1.6
There is no such version of R, and never has been.
> OS: Windows 98 / Windows Xp
> Submission from: (NULL) (81.63.111.226)
>
>
> To control the progress of a function one can consider to use print() to
issue a
> message in the command window. However, using Win98 / R 1.9 or WinXP / R
2.0,
> this approach is of little usefulness, since all the print() commands are
issued
> at once, just before the control returns to the command window. A test code
> could be:
>
> for(i in 1:10){
> for(j in 1:1000){
>  for(k in 1:1000){}
> }
> print(i)
> }
>
> I once ask a linux / unix user and he was not able to reproduce the 
> problem.
-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

markus.liedgens@ipw.agrl.ethz.ch writes:
> To control the progress of a function one can consider to use print() to
issue a
> message in the command window. However, using Win98 / R 1.9 or WinXP / R
2.0,
> this approach is of little usefulness, since all the print() commands are
issued
> at once, just before the control returns to the command window. A test code
> could be:
> 
> for(i in 1:10){
>  for(j in 1:1000){
>   for(k in 1:1000){}
>  }
>  print(i)
> }
> 
> I once ask a linux / unix user and he was not able to reproduce the
problem.
It IS a FAQ though...

http://cran.r-project.org/bin/windows/base/rw-FAQ.html#The-output-to-the-console-seems-to-be-delayed

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
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