On Fri, 8 Aug 2008, Peter Dalgaard wrote:
Marc Schwartz wrote:
Try:
> 8*4
[1] 32
As per the help page for .Machine:
sizeof.pointer the number of *bytes* in a C SEXP type.
So:
8 bits per byte * 4 bytes = 32 bits
Also (outside of R) type "uname -a". This should give something like
Linux viggo 2.6.18.8-0.10-default #1 SMP Wed Jun 4 15:46:34 UTC 2008 x86_64
x86_64 x86_64 GNU/Linux
on a 64-bit system (SUSE in this case)
Note though that you can run 32-bit R on a 64-bit system, and telling the
pointer size from uname -a is trickier on other OSes. E.g. a Solaris box
says
blackhawk% uname -a
SunOS blackhawk 5.10 Generic_137112-04 i86pc i386 i86pc
Or on Mac OS
blacklark% uname -a
Darwin blacklark.stats.ox.ac.uk 9.4.0 Darwin Kernel Version 9.4.0: Mon Jun
9 19:30:53 PDT 2008; root:xnu-1228.5.20~1/RELEASE_I386 i386
and I run both 32- and 64-bit R on both those systems. Thus you do need
to ask the R binary.
but
Linux turmalin 2.6.22.18-0.2-default #1 SMP 2008-06-09 13:53:20 +0200 i686
i686 i386 GNU/Linux
on 32-bitters
:-)
HTH,
Marc Schwartz
on 08/08/2008 03:58 PM milton ruser wrote:
Dear Prof. B.Ripley,
If :
.Machine$sizeof.pointer
[1] 4
2*2*2*2
[1] 16
So I am running with 16 bits?
How can I know the number of bits supported on my machine?
Kindly,
miltinho astronauta
brazil
On 8/8/08, Prof Brian Ripley <[EMAIL PROTECTED]> wrote:
Look at .Machine$sizeof.pointer (in bytes).
On Fri, 8 Aug 2008, Tom La Bone wrote:
I think I installed 64-bit Ubuntu 8.04 and 64-bit R on my computer. I
can't
seem to find anything that says "this is 64-bit Ubuntu" or "this is
64-bit
R". How do I tell what version of R I am running?
Tom
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--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
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and provide commented, minimal, self-contained, reproducible code.
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
