If it's of any help, our CG and GMRES solvers (and maybe some of the
others?) can return the estimated condition number during / after a call
to solve().
https://dealii.org/developer/doxygen/deal.II/classSolverCG.html#a52f1fd3d41765ec06d2d0add1a74a37c
<https://dealii.org/developer/doxygen/deal.II/classSolverCG.html#a52f1fd3d41765ec06d2d0add1a74a37c>
https://dealii.org/developer/doxygen/deal.II/classSolverGMRES.html#a3025d81c3d7db3e1a1b0114bef794202
<https://dealii.org/developer/doxygen/deal.II/classSolverGMRES.html#a3025d81c3d7db3e1a1b0114bef794202>
Jean-Paul
On 03.12.20 05:46, Wolfgang Bangerth wrote:
On 12/2/20 9:30 PM, Reza Rastak wrote:
I am trying to calculate the condition number of a Trilinos Block
Sparse matrix. Is there an example of that in the documentation that
you can point me to?
No, and that's actually a quite difficult task because you have to
estimate eigenvalues. The easiest way is probably to use the power
iteration and inverse power iteration to estimate largest and smallest
eigenvalues -- see the EigenPower and EigenInverse classes.
Best
W.
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