[Rd] R limits documented?
Simon Urbanek
simon.urbanek at r-project.org
Sat Feb 12 02:45:06 CET 2011
On Feb 11, 2011, at 7:55 PM, David Winsemius wrote:
>
> On Feb 11, 2011, at 7:09 PM, Dominick Samperi wrote:
>
>> Is there documentation on R limits?
>> That is, max matrix size, etc.?
>>
>> Diagnostics when limits are exceeded are not always
>> meaningful. For example:
>>> x <- rep(0,50000*50000)
>> Error in rep(0, 50000 * 50000) : invalid 'times' argument
>> In addition: Warning message:
>> In as.vector(data) : NAs introduced by coercion
>
> > x <- rep(0,40000*50000)
> > gc()
> used (Mb) gc trigger (Mb) max used (Mb)
> Ncells 4673306 249.6 6945861 371.0 5315868 283.9
> Vcells 2165579376 16522.1 4374103452 33371.8 4165580443 31780.9
> > object.size(x)
> 16000000040 bytes
>
> So that is about 2/3 of my installed memory. This seems to be a limitation due to the maximum positive integer being ~ 2*10^9
> > 2*10^9 < 50000*50000
> [1] TRUE
> > 2*10^9 < 40000*50000
> [1] FALSE
>
The actual limit is for obvious reasons 2^31-1
> as.integer(2^31-1)
[1] 2147483647
> as.integer(2^31)
[1] NA
Warning message:
NAs introduced by coercion
(ok, for those that this is not obvious: the integer type ("int" in C) is 32-bit wide and it is a signed type so the range is -2^31-1 .. 2^31-1 -- the minus one on each side is the representation of NA and 0 respectively).
Cheers,
Simon
>>
>> Here's another example:
>>> library(orthopolynom)
>>> hermite <- hermite.h.polynomials(1001)
>>> hermite[[1001]] # should display 1000-th degree polynomial
>> Error in if (signs[1] == "- ") "-" else "" :
>> missing value where TRUE/FALSE needed
>
> Sounds as though the maximum length of an element of type character has been exceeded.
>>
>> Thanks,
>> Dominick
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>
> David Winsemius, MD
> West Hartford, CT
>
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