Re: Extended precision

[Arvid Rosén]

Andy Adler wrote:
> On Mon, 27 Feb 2006, Arvid Rosén wrote:
>
>   
> > Hi!
> > I am frequently working with ill-conditioned state-space systems, and
> > the matrix calculations often lead to problems. Are there any ways to
> > get increasted or extended precision in Octave? 128-bit doubles or more
> > would probably help alot in this case.
> >     
>
> I work with ill-conditioned systems for much of my research.
> and I would tend to be very suspicious of a statement like that.
>
> If the underlying problem is ill-conditioned then needing 128-bit
> doubles is probably avoiding the real issue, as an algorithm which
> is sensitive to rounding in this way has probably diverged long ago.
>
> I would look into regularization techniques to improve the
> conditioning of the algorithms.
>
> --
> Andy Adler <address@hidden> 1(613)562-5800x6218
Thanks Andy!
I'll bet you are right here. I was just hoping that someone would tell 
my about the new HYPER-MEGE-PRECISION-flag in octave-2.9 ;-)
I guess I'll have to go and find myself a nice textbook (any 
recommendations?) on the topic and get started fixing the real problem.

/Arvid



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