search for: pardiso

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/repo...

There have been several messages on R-devel mentioning the interior point optimization software Ipopt, https://projects.coin-op/Ipopt/. This C++ library is released under a license called the Common Public License. I have two questions that readers of R-devel may be able to answer. 1) Would creating an Ipopt interface for R be duplicating existing efforts? That is, has someone already done so