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From: Virgil on 18 Jan 2008 00:49
In article <13p057m2g45c7d1(a)corp.supernews.com>,
~kurt <actinouranium(a)earthlink.net> wrote:

> Irl <irl1(a)mindspring.com> wrote:
> >
> > The determinants are in a ratio of 100:1.
>
> Going back and row reducing the matrix before inversion showed that the
> two rows were nearly identical. A friend was pointing out that you can
> treat each column as a vector, and find the angle between each "vector".
> The closer the angle is to zero, the less well behaved the matrix. The
> one I was working with had an angle of about 0.002 deg....
>
> - Kurt

There is, at least for the hp49,49+ and 50, the alternative of doing
exact determinants or exact row reductions.
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