Re: [R] Memory question

From: Spencer Graves <>
Date: Thu 14 Jul 2005 - 13:22:53 EST

          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 matrices?

          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 <>
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Received on Thu Jul 14 13:29:56 2005

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