[petsc-users] Need to update matrix in every loop

[Jed Brown]

sheng liu <ustc.liu at gmail.com> writes:

> Thank you very much! I have another question. If I need all the eigenvalues
> of the sparse matrix, which solver should I use? Thanks!

That's O(n^3) with n=1e6.  Better find a way to not need all the
eigenvalues or to make the system smaller.
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