Eigenvector routine....

Does anyone know of a small, simple, freely available Eigenvector routine?

My application has been developed using jacobi.c (and eigsrt.c) from
Numerical Recipes. This works well for me, but the application will soon be
released under the GPL, and the nice folks at NR don't want their source
distributed around. I could just leave stubs in place and require people to
get the routines themselves, but I'd rather replace the routines with
something more available.

I don't really want to introduce a dependency on a large numerical toolkit,
instead, I'd like to just pull in the relevant code. Something small and
simple is preferred over the latest & greatest.

In fact, the problem is nearly trivial. Find the eigenvectors & eigenvalues
of a real, symmetric, 3x3 matrix. Then, all I need is the eigenvector with
the smallest eigenvalue.

With such a small problem, I'm surprised there isn't an even simpler
approach...

Any help will be appreciated,

Rob


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