Re: [R] Gaussian elimination - singular matrix

From: Bruce Willy <croero_at_hotmail.com>
Date: Wed, 27 Jun 2007 22:59:38 +0000

I am sorry, there is just a mistake : the solution cannot be unique (because it is a vectorial space) (but then I might normalize it)  

can R find one anyway ?  

This is equivalent to finding an eigenvector in fact> From: croero_at_hotmail.com> To: r-help_at_stat.math.ethz.ch> Date: Wed, 27 Jun 2007 22:51:41 +0000> Subject: [R] Gaussian elimination - singular matrix> > > Hello,> > I hope it is not a too stupid question.> > I have a singular matrix A (so not invertible).> > I want to find a nontrivial nonnegative solution to AX=0 (kernel of A)> > It is a special matrix A (so maybe this nonnegative solution is unique)> > The authors of the article suggest a Gaussian elimination method> > Do you know if R can do that automatically ? I have seen that "solve" has an option "LAPACK" but it does not seem to work with me :(> > Thank you very much> _________________________________________________________________> Le blog Messenger de Michel, candidat de la Nouvelle Star : analyse, news, coulisses… A découvrir !> > [[alternative HTML version deleted]]> 
_________________________________________________________________
Le blog Messenger de Michel, candidat de la Nouvelle Star : analyse, news, coulisses… A découvrir !

        [[alternative HTML version deleted]]



R-help_at_stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Wed 27 Jun 2007 - 23:06:50 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Thu 28 Jun 2007 - 01:34:11 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.