[R] How Can I Tell if the R Running is 64 bit or 32 bit?

[Peter Dalgaard]

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)

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$sizeof.pointer
>> [1] 4
>>> 2*2*2*2
>> [1] 16
>>
>> So I am running with 16 bits?
>>
>> How can I know the number of bits supported on my machine?
>>
>> Kindly,
>>
>> miltinho astronauta
>> brazil
>>
>> On 8/8/08, Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:
>>> Look at .Machine$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
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