Dear R-Help list: I'm using the Matrix library to operate on 600 X ~5000 element unsymmetrical sparse arrays. So far, so good, but if I find I need more speed or functionality, how hard would it be to utilize other sparse matrix toolsets from within R, say MUMPS, PARDISO or UMFPACK, that do not have explicit R interfaces? More information on these is available here www.cise.ufl.edu/research/sparse/umfpack/ www.computational.unibas.ch/cs/scicomp/software/pardiso www.enseeiht.fr/lima/apo/MUMPS/ and in these reviews ftp://ftp.numerical.rl.ac.uk/pub/reports/ghsNAGIR20051r1.pdf http://www.cise.ufl.edu/research/sparse/codes/ neither of which reviewed the R Matrix package, unfortunately. Thanks, - John Thaden, Ph.D., U. Arkansas for Med. Sci., Little Rock.
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