(HP71B) Eigenvalues of Symmetric Real Matrix

[Thomas Klemm]

(11-26-2023 05:16 PM)Albert Chan Wrote:  Anyone knows how it work, or reference (besides AFH) to where algorithm comes from?

It looks like Jacobi eigenvalue algorithm to me:

Quote:Set this equal to 0, and rearrange:

\(
\tan(2\theta) = \frac{2 S_{ij}}{S_{jj} - S_{ii}}
\)

Or maybe a variant of it.