[Rd] long integer in R?

blue sky bluesky315 at gmail.com
Sat Feb 13 23:04:16 CET 2010

On Fri, Feb 12, 2010 at 12:06 PM, Simon Urbanek
<simon.urbanek at r-project.org> wrote:
> On Feb 12, 2010, at 12:33 , blue sky wrote:
>> R-exts.pdf dosen't list many types that are supported in C++, for example,
>> long. Are there storage.mode corresponds to those extra types?
> There are none - that's why they are not listed. As for long: on 32-bit
> platforms (and Win64) int and long are equivalent so you can simply use
> INTSXP. On 64-bit unix platforms (LP64) there is no way to losslessly use it
> (other than raw) but in most applications you can simply use REALSXP as it
> gives you at least 52-bits of precision which its sufficient for most
> applications.

According to ?integer,

"Note that on *almost* all implementations of R the range of
representable integers is restricted to about +/-2*10^9: ‘double’s
can hold much larger integers exactly."

It uses 'almost'. I'm wondering on what platform integer is not
restricted to about +/-2*10^9 so that double's can not hold large
integers exactly?

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