[R] Memory question

Spencer Graves spencer.graves at pdf.com
Thu Jul 14 05:22:53 CEST 2005

	  What kinds of matrices?  There are facilities in the Matrix and 
SparseM packages that might help for sparse matrices.  If they are N x k 
where N is large and k is not, can you compute something like the QR 
decomposition and get away with keeping only the R part for most of your 

	  One could potentially define a class of matrices that are only kept 
in memory only when needed;  I think S-Plus may do that.  It would take 
a lot of work to make that work generally, but you might be able to 
accomplish what you need with a much smaller effort.

	  spencer graves

Kenneth Roy Cabrera Torres wrote:

> Hi R users and developers:
> I want to know how can I save memory in R
> for example:
>   - saving on disk a matrix.
>   - using again the matrix (changing their values)
>   - saving again the matrix on disk in a different file.
> The idea is that I have a process that generate several
> matrices, but if I keep them all in memory it will overflow.
> How can I save them in different files, so I use the same
> amount of memory for each processed matrix?
> Thank you for your help.

Spencer Graves, PhD
Senior Development Engineer
PDF Solutions, Inc.
333 West San Carlos Street Suite 700
San Jose, CA 95110, USA

spencer.graves at pdf.com
www.pdf.com <http://www.pdf.com>
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