On 13 Apr 2004, Peter Dalgaard wrote: > "Roger D. Peng" <[EMAIL PROTECTED]> writes: > > > As far as I know, R does compile on AMD Opterons and runs as a 64-bit > > application. So it can store objects larger than 4GB. However, I > > don't think R gets tested very often on 64-bit machines with such > > large objects so there may be yet undiscovered bugs. > > There are a few such machines around among R users, and R seems to > work OK on them. One slight gotcha is that the Fortran numeric > libraries (Lapack, ATLAS) tend to use integer indexing, which might > overflow for large objects. Things like data frames which consist of > multiple subobjects might be less sensitive to this.
At present we restrict vectors to 2^31-1 and as from 1.9.0 have many overflow checks in place. It's not just Fortran code, BTW: integer indexing in C is pervasive in the R code, including in many add-on packages. So you can use large workspaces (and as someone said, this has been done under Solaris and Compaq Alpha for at least a couple of years), and large lists (including data frames), but the size of atomic vectors is limited in a rather fundamental way. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
