On Feb 11, 2011, at 8:45 PM, Simon Urbanek wrote:
>
> 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).
>
correction: the range should have read -(2^31-1) .. 2^31
> 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@r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>> David Winsemius, MD
>> West Hartford, CT
>>
>> ______________________________________________
>> R-devel@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>>
>
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