Re: Understanding how octave works...

[Ross Vandegrift]

On Mon, Jan 26, 2004 at 03:14:15PM +0100, Joerg Frochte wrote:
> This has something to do with the fact that A is very close to be singular.
> 
> octave:21> cond(A)
> ans =  2.9251e+18

If you're interested in algorithms that are capable of dealing with
problematic matricies, check out a text on numerical analysis from your
local library.  In the course I took last semester, we used Burden and Faires,
"Numerical Analysis".  This text is pretty broad about numerical algorithms
in general and covers everything from linear systems to differential
equations.  It includes lots of discussion of ill-conditioning.

There's also a text that came up a lot by Van Loan, but I don't recall
the title.  I'm sure someone else can point you in this direction - it
covered more of the advanced numerical approaches for problematic
systems and iterative methods.

-- 
Ross Vandegrift
address@hidden

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