[R] allocMatrix limits
maechler at stat.math.ethz.ch
Fri Aug 1 15:38:56 CEST 2008
>>>>> "VK" == Vadim Kutsyy <vadim at kutsyy.com>
>>>>> on Thu, 31 Jul 2008 15:43:56 -0700 writes:
>>> I am getting an error "allocMatrix: too many elements
>>> specified" when I am trying to create large matrix or
>>> vector (about 1 billion elements).
>>> How can I find out limits on allocMatrix? Can I increase
>> ?"Memory-limits", and you cannot increase them unless you
>> have a system which has larger signed integers.
VK> Thank you for pointing out this.
VK> The problem is in array.c, where allocMatrix check for
VK> "if ((double)nrow * (double)ncol > INT_MAX)". But why
VK> itn is used and not long int for indexing? (max int is
VK> 2147483647, max long int is 9223372036854775807)
Well, Brian gave you all info:
Did you really carefully read ?Memory-limits
BTW: The package 'Matrix' has many facilities to work with
sparse matrices; and these facilities are used in "lme4" and
more than a dozen other CRAN packages to work with sparse
matrices in the order of 10^5 x 10^5, sometimes even
10^6 x 10^6, *but* with sparse content.
Martin Maechler, ETH Zurich
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