[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
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
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spencer.graves at pdf.com
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