[R] Determining 32- vs. 64-bit Windows

[Fisher Dennis]

Peter

Your proposal appears to work better than expected:	
	On a 64-bit machine, it reported
		64 when R64 was launched
		32 when R62 was launched
	On a 32-bit machine, it reported 32.

The underlying issue for me is that I am calling c code — I want to make sure that I don’t call 64-bit c code when I am using 32-bit R (either in Windows 32- or 64-bit).  

Dennis


Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
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www.PLessThan.com



On Apr 10, 2014, at 1:23 PM, peter dalgaard <pdalgd at gmail.com> wrote:

> I believe that b. is .Machine$sizeof.pointer*8. 
> 
> I am not aware of a method to figure out the difficult part of a.: whether a 32 bit R is running on 64 bit Windows. I'd expect that you have to ask the OS somehow. Google coughs up one or two interesting pointers.
> 
> -pd  
> 
> On 10 Apr 2014, at 21:48 , Fisher Dennis <fisher at plessthan.com> wrote:
> 
>> 3.0.2
>> Windows
>> 
>> Colleagues,
>> 
>> If I am setting up code for others and I don’t know their configuration, what is the simplest way to find out the following within R:
>> 	a.  is the system 32- or 64-bit?
>> 	b.  if the system is 64-bit, is R 32- or 64-bit?
>> 
>> Dennis
>> 
>> Dennis Fisher MD
>> P < (The "P Less Than" Company)
>> Phone: 1-866-PLessThan (1-866-753-7784)
>> Fax: 1-866-PLessThan (1-866-753-7784)
>> www.PLessThan.com
>> 
>> 
>> 
>> 
>> 	[[alternative HTML version deleted]]
>> 
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>> and provide commented, minimal, self-contained, reproducible code.
> 
> -- 
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
> 
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