I am sorry that it has been couple days. I've read the website you provided below, but still don't quite know if this is doable. The maximum vector length is 2^31-1, so here is what I tired, and it returned errors as below.
P=20000 D=matrix(rep(0, P*P), nrow=P) Error: cannot allocate vector of size 1.5 Gb In addition: Warning messages: 1: In as.vector(data) : Reached total allocation of 1535Mb: see help(memory.size) On the manuals, it says "32-bit OSes by default limit file sizes to 2GB ", so why P=20000 is not working here ? Thanks for any helps. I appreciate. On Sat, Oct 2, 2010 at 12:22 PM, Marc Schwartz <marc_schwa...@me.com> wrote: > On Oct 2, 2010, at 11:14 AM, Carrie Li wrote: > > > Hi everyone, > > > > If I run on a 64-bit R, what is the maximum matrix size that it can > handle ? > > Is a matrix 20,000 x 20,000 possible on 32 bit ? > > Thanks for answering! > > > A matrix is a vector with 'dim' attributes. The maximum vector length is > 2^31 - 1 and that does not change between 32 and 64 bit R. The primary > advantage of 64 bit R is the larger memory address space. > > See: > > > http://cran.r-project.org/doc/manuals/R-admin.html#Choosing-between-32_002d-and-64_002dbit-builds > > HTH, > > Marc Schwartz > > [[alternative HTML version deleted]] ______________________________________________ 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.
