PreconditionChebyshev: Implement power iteration for eigenvalue estimate #13792
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peterrum
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Note that I had a small bug in my code (I did not copy the eigenvalue estimation algorithm in the copy assignment operator of |
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…ation PreconditionChebyshev: Implement power iteration for eigenvalue estimate
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This implements a different option for the eigenvalue estimation in PreconditionChebyshev. In general, the Lanczos algorithm that we use as a default results in much more accurate predictions for the same number of iterations, but the new option might be useful for some non-symmetric matrices.