Re: ill-conditioned matrix
- To: mathgroup at smc.vnet.net
- Subject: [mg43505] Re: [mg43455] ill-conditioned matrix
- From: Michael Schreiber <michaelschreiber at mac.com>
- Date: Thu, 18 Sep 2003 05:39:44 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On Wednesday, Sep 17, 2003, at 13:59 Europe/Vienna, arash yavari wrote: > Hello, > > Does anybody know what the best way of multiplying > ill-conditioned matrices in Mathematica is? Mathematica Book 1.8.3 about Dot etc; more 3.7.1-3.7.12. > I also need to solve a linear system with an ill-conditioned > representing matrix. LinearSolveFunction generated by LinearSolve for similar problems to solve again and again (New in Version 5); QRDecomposition for more equations than variables (over determined system). Further Examples for LUDecomposition relate precision of fastest approximation to fast exact solutions by magnitude of matrix condition number (for calculation of matrix condition number norms see LinearAlgebra`MatrixManipulation`). > What is the most efficient and > accurate way of doing this by Mathematica? Thanks! > Regards, > Arash > > __________________________________ > Do you Yahoo!? > Yahoo! SiteBuilder - Free, easy-to-use web site design software > http://sitebuilder.yahoo.com > > M F Schreiber Heimscholleg 26 Wien, A1130 Austria Europe Michael at Schreiber.at