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See https://www.openrev.org/paper/preconditioned-recycling-krylov-subspace-methods-for-self-adjoint-problems?qu=9401 for other ideas, too.
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It has been cautioned in ARPACK docs that one must link to the LAPACK 2.0 that ships with ARPACK. Specifically, it is the `dlahqr` routine that we need from LAPACK 2.0. Since arpack-ng does not includ…
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Just tried out the test script for CG. It returns a stack overflow.
```
ERROR: stack overflow
in KrylovSubspace at /Users/larsruthotto/Dropbox/Julia/Modules/IterativeSolvers/src/krylov.jl:25 (repea…