Hong <[email protected]> writes: > Toon : >> Sorry, I forgot to mention: I am looking for the Eigenvalues that are the >> largest, not in absolute value, but along the real axis. > > Then, you do not need shift-invert, therefore, should not use LU > matrix factorization.
The error is in STSetUp_Shift, not STSetUp_Sinvert. This is a generalized eigenvalue problem. Of course you can change the PC, but I think we should understand the problem first.
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