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...perform the calculation above I get approximately the right answer. The approximation is quite good. However it is an approximation. Any suggestion? Thank you very much! Simon >----Messaggio originale---- >Da: P.Dalgaard at biostat.ku.dk >Data: 23-nov-2009 14.09 >A: "simona.racioppi at libero.it"<simona.racioppi at libero.it> >Cc: "Charles C. Berry"<cberry at tajo.ucsd.edu>, <r-help at r-project.org> >Ogg: Re: R: Re: [R] chol( neg.def.matrix ) WAS: Re: Choleski and Choleski with pivoting of matrix fails > >simona.racioppi at libero...

...a number made up of both a real and an imaginary part. This does not probably mean much if the trace of the matrix below givens me info about the degrees of freedom of a model... Simona >----Messaggio originale---- >Da: RVaradhan at jhmi.edu >Data: 25-nov-2009 18.55 >A: <simona.racioppi at libero.it>, <P.Dalgaard at biostat.ku.dk> >Cc: <r-help at r-project.org> >Ogg: RE: [R] R: Re: R: Re: chol( neg.def.matrix ) WAS: Re: Choleski and Choleski with pivoting of matrix fails > >I do not understand what the problem is, as it works just fine for me: > >...

...how do I convert it to a real (not imaginary) matrix which has the same property? Is that possible? Best, Simon >----Messaggio originale---- >Da: p.dalgaard at biostat.ku.dk >Data: 21-nov-2009 18.56 >A: "Charles C. Berry"<cberry at tajo.ucsd.edu> >Cc: "simona.racioppi at libero.it"<simona.racioppi at libero.it>, <r-help at r- project.org> >Ogg: Re: [R] chol( neg.def.matrix ) WAS: Re: Choleski and Choleski with pivoting of matrix fails > >Charles C. Berry wrote: >> On Sat, 21 Nov 2009, simona.racioppi at libero.it wrote: >>...