[R] Memory Efficiency of Symmetric Matrix

[andrew]

the SparseM package might be what you are looking for

http://www.econ.uiuc.edu/~roger/research/sparse/SparseM.pdf

On Jan 7, 11:36 am, Søren Højsgaard <Soren.Hojsga... at agrsci.dk> wrote:
> You can do
> mat[lower.tri(mat, diag=F)]
> Søren
>
> ________________________________
>
> Fra: r-help-boun... at r-project.org på vegne af Nathan S. Watson-Haigh
> Sendt: on 07-01-2009 01:28
> Til: r-h... at r-project.org
> Emne: [R] Memory Efficiency of Symmetric Matrix
>
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> I'm generating a symmetric correlation matrix using a data matrix as input:
> mat <- cor(data.mat)
>
> My question is:
> Is there a more memory efficient way to store this data? For instance, since:
> all(mat == t(mat))
> every value is duplicated, and I should be able to almost half the memory usage for large matrices.
>
> Any thoughts/comments?
>
> Cheers,
> Nathan
>
> - --
> - --------------------------------------------------------
> Dr. Nathan S. Watson-Haigh
> OCE Post Doctoral Fellow
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