[petsc-users] Question about eigenvalue and eigenvectors

[Stefano Zampini]

For 3x3 matrices you can use explicit formulas

On Sat, Dec 24, 2022, 11:20 김성익 <ksi2443 at gmail.com> wrote:

> Hello,
>
>
> I tried to calculate the eigenvalues and eigenvectors in 3 by 3 matrix
> (real and nonsymmetric).
> I already checked the kspcomputeeigenvalues and kspcomputeritz.
>
> However, the target matrix is just 3 by 3 matrix.
> So I need another way to calculate the values and vectors.
> Can anyone recommend other methods that are efficient for such small size
> problems??
>
> Thanks,
> Hyung Kim
>
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