Hi.
Using Rterm v2.2.1 on WinXP, is there a way to interrupt a call like
repeat { readline() }
without killing the Command window? Ctrl+C is not interrupting the loop:
R : Copyright 2006, The R Foundation for Statistical Computing
Version 2.2.1 Patched (2006-01-01 r36947)
<snip></snip>
> repeat { readline() }
^C
^C
^C
^C
On Unix it works. The problem seems to get the interrupt signal to
"occur" outside the readline() call so that "repeat" is
interrupted. Doing
repeat { readline(); Sys.sleep(3) }
and it is likely that can generate an interrupt signal outside readline().
It seem like readline()/readLines(n=1) or an underlying method catches
the interrupt signal quietly and just waits for a symbol to come
through. Try readline() by itself and press Ctrl+C. Maybe this is a
property of the Windows Command terminal, I don't know, but is it a
wanted feature and are R core aware of it? Note that, in Rgui it is
possible to interrupting such a loop by pressing ESC.
Cheers
Henrik
Ctrl-Break works: see the rw-FAQ and README.rterm. (You'll need a return to see a new prompt.) It is related to your reading directly from the console, so Ctrl-C is getting sent to the wrong place, I believe. (There's a comment from Guido somewhere in the sources about this, and this seems corroborated by the fact that Ctrl-C will interrupt under Rterm --ess.) On Sun, 8 Jan 2006, Henrik Bengtsson wrote:> Hi. > > Using Rterm v2.2.1 on WinXP, is there a way to interrupt a call like > > repeat { readline() } > > without killing the Command window? Ctrl+C is not interrupting the loop: > > R : Copyright 2006, The R Foundation for Statistical Computing > Version 2.2.1 Patched (2006-01-01 r36947) > <snip></snip> > > > repeat { readline() } > ^C > ^C > ^C > ^C > > On Unix it works. The problem seems to get the interrupt signal to > "occur" outside the readline() call so that "repeat" is interrupted. Doing > > repeat { readline(); Sys.sleep(3) } > > and it is likely that can generate an interrupt signal outside readline(). > > It seem like readline()/readLines(n=1) or an underlying method catches > the interrupt signal quietly and just waits for a symbol to come > through. Try readline() by itself and press Ctrl+C. Maybe this is a > property of the Windows Command terminal, I don't know, but is it a > wanted feature and are R core aware of it? Note that, in Rgui it is > possible to interrupting such a loop by pressing ESC. > > Cheers > > Henrik > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >-- Brian D. Ripley, ripley at 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
On a related note, does anyone know how to exit:
repeat { try( readline() ) }
The try block captures Ctrl-C.
Hadley
--- Henrik Bengtsson <hb at maths.lth.se> a ??crit :> Hi. > > Using Rterm v2.2.1 on WinXP, is there a way to > interrupt a call like > > repeat { readline() } > > without killing the Command window? Ctrl+C is not > interrupting the loop:To interupt the loop add and condition for a break like this : if () break> > R : Copyright 2006, The R Foundation for Statistical > Computing > Version 2.2.1 Patched (2006-01-01 r36947) > <snip></snip> > > > repeat { readline() } > ^C > ^C > ^C > ^C > > On Unix it works. The problem seems to get the > interrupt signal to > "occur" outside the readline() call so that "repeat" > is interrupted. Doing > > repeat { readline(); Sys.sleep(3) } > > and it is likely that can generate an interrupt > signal outside readline(). > > It seem like readline()/readLines(n=1) or an > underlying method catches > the interrupt signal quietly and just waits for a > symbol to come > through. Try readline() by itself and press Ctrl+C. > Maybe this is a > property of the Windows Command terminal, I don't > know, but is it a > wanted feature and are R core aware of it? Note > that, in Rgui it is > possible to interrupting such a loop by pressing > ESC. > > Cheers > > Henrik > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html >
Use tryCatch; try behaves the way it does with respect to interrupts for historical compatibility. luke On Sun, 8 Jan 2006, hadley wickham wrote:> On a related note, does anyone know how to exit: > > repeat { try( readline() ) } > > The try block captures Ctrl-C. > > Hadley > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >-- Luke Tierney Chair, Statistics and Actuarial Science Ralph E. Wareham Professor of Mathematical Sciences University of Iowa Phone: 319-335-3386 Department of Statistics and Fax: 319-335-3017 Actuarial Science 241 Schaeffer Hall email: luke at stat.uiowa.edu Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu