[R] sprintf() question
djnordlund at verizon.net
Mon May 18 01:52:14 CEST 2009
> -----Original Message-----
> From: Ted Harding [mailto:Ted.Harding at manchester.ac.uk]
> Sent: Sunday, May 17, 2009 3:32 PM
> To: Daniel Nordlund
> Cc: r-help at r-project.org
> Subject: RE: [R] sprintf() question
> On 17-May-09 22:03:19, Daniel Nordlund wrote:
> > When I type the following, I get results different from what I
> > expected.
> >> sprintf('%a',3)
> >  "0x1.8"
> > Shouldn't the result be
> >  "0x1.8p+2"
> Well, not "p+2" but "p+1"
> (0x1.8 = 1.1000 ; *2 = 11.000 = 3) ;
> however, I get:
> #  "0x1.8p+1"
> which is indeed correct.
> R version 2.9.0 (2009-04-17) ## Same as yours
> platform i486-pc-linux-gnu ## Different from yours ...
> which perhaps suggests that there may be a mis-compilation in the
> Windows version.
> > I read through the help ?sprintf and didn't find anything
> that changed
> > my expectation. What am I misunderstanding? I am using
> R-2.9.0 binary
> > from CRAN on Windows XP Pro, and my session info is
> >> sessionInfo()
> > R version 2.9.0 (2009-04-17)
> > i386-pc-mingw32
> > locale:
> > LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
> > States.1252;LC_MONETARY=English_United
> > States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
> > attached base packages:
> >  stats graphics grDevices utils datasets
> methods base
> > Thanks for any enlightenment.
Enlightenment is what I asked for, and it is what I got. I was having a
senior moment I guess. I was picturing 8 as binary 0100, when obviously it
is binary 1000. So yes, the required power of 2 is 1, and it is fine with
me that Windows implementation does not display it. Thanks again.
Bothell, WA USA
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