[R] Big matrix memory problem

Prof Brian Ripley ripley at stats.ox.ac.uk
Fri May 13 14:57:40 CEST 2005

On Fri, 13 May 2005, s104100026 wrote:

> Hi All,
> I want to read 256 1000x1000 matrices into R. I understand that it is unlikely
> that I can do this but In the hope that somebody can help me I am mailing this
> list.

What sort of matrix?  If these are real numbers that is 2Gb.

> I have tried increasing my memory size (I understand that it is the minimum of
> 1024 or the computers RAM in my case 512)
> Does anyone think this is possible in R, could it be tried in Splus for
> example.

It is possible in R, but you will need a 64-bit version of R.  Since you
don't state your OS, my guess is it is Windows or MacOS, for neither of
which we have a 64-bit port as yet.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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