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From: "Bruno Luong" <b.luong@fogale.findmycountry>
Newsgroups: comp.soft-sys.matlab
Subject: Re: factorize singular symmetric matrix
Date: Tue, 29 Sep 2009 18:39:03 +0000 (UTC)
Organization: FOGALE nanotech
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Stefano,

Note that Gram-Schmidth is nothing more than an unstable way of doing QR factorization (the later uses Householder reflection or Given rotation to "orthogonalize" the vectors). 

Bruno