First, I don't think cat(70,"\r") has ever been useful in Rgui.
It outputs and then deletes a line: Rgui has never supported
overwriting. I think you really want cat('\r', i, sep="").
Second, in some circumstances in 2.12.0 only, some storage was
discarded too early and so random characters might appear. This has
now been fixed, so please try a recent R-patched.
But the main problem was the expectation: there is nothing that I know
of which says that '\r' works in the way it does in some (but not all)
Unix terminals.
On Sun, 7 Nov 2010, Russell Pierce wrote:
I am experiencing unexpected behavior with the command cat under
Window GUI builds of R version 2.12.0 (it does not seem to be an issue
in Rterm). For example if I issue the command cat(70,"\r") I get back
text that looks like Asian characters. If I highlight and copy that
text, it is the text I would regularly expect, e.g. the number 70 and
the prompt line. Highlighting the text changes what is shown on the
screen, but the screen never displays the number 70. This error is
not idiosyncratic to 70 but happens with a fairly wide range of
numbers. Notably no error like this occurs when I use \n. I use \r
for large simulation runs when I don't want my progress to spam the
display.
e.g.
for (i in 1:1000) {cat(i,"\r");flush.console();Sys.sleep(.100)}
sessionInfo() where I first saw the problem:
R version 2.12.0 (2010-10-15) on Windows Vista
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Also experienced here:
R version 2.12.0 (2010-10-15) on Windows XP
R version 2.12.0 Patched (2010-11-04 r53530) on Windows Vista
R version 2.13.0 Under development (unstable) (2010-11-04 r53530) on
Windows Vista
But not here:
Not under R version 2.10.1 (2009-12-14) on Windows XP
If this is expected behavior would you please kindly explain it to me?
I am not a member of this list, so please address replies both to my
email address and (if appropriate) the list.
Best,
Russell Pierce
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Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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