If you want 128 combinations, then generate 8 16-bit random numbers and concatenate them together. You will have to check for dups as you generate the sequence, but it is at least a start and should fit within the memory of the system.
On Mon, Apr 6, 2009 at 7:39 PM, David Katz <da...@davidkatzconsulting.com> wrote: > > This is very cool indeed until you want to use more than 32 or so terms and > most operating systems force you to go to floating point. > >> x=sample(2^34,1000) > Error in sample(2^34, 1000) : invalid 'x' argument > In addition: Warning message: > In sample(2^34, 1000) : NAs introduced by coercion > > > > jholtman wrote: >> >> Are you just trying to obtain a combination from 25 possible terms? >> If so, then just sample the number you want and convert the number to >> binary: >> >>> sample(33554432,100) >> [1] 6911360 5924262 23052661 12888381 25831589 16700013 24079278 >> 33282839 12751862 26086726 31363494 7118320 21866536 4212929 >> > > David Katz > www.davidkatzconsulting.com > > -- > View this message in context: > http://www.nabble.com/how-to-subsample-all-possible-combinations-of-n-species-taken-1%3An-at-a-time--tp22911399p22919597.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
