--- In jsci@yahoogroups.com, Mark Hale <mj_hale@...> wrote:
>
> It could be a numerical instability problem, post the
> actual matrix so I can take a look.
>

Thank you for replying my message.

Here is one example I get NaN as the result of determinant.

a 3 by 3 matrix of 1s.

1.0 1.0 1.0
1.0 1.0 1.0
1.0 1.0 1.0

Thanks a lot