Class Scine::Utils::IndirectSigmaVectorEvaluator

template<class MatrixType>
class IndirectSigmaVectorEvaluator : public Scine::Utils::SigmaVectorEvaluator<MatrixType>

This sigma vector evaluator calculates the sigma vector as described in Davidson’s iterative method paper.

E. R. Davidson, The iterative calculation of a few of the lowest eigenvalues and corresponding eigenvectors of large real-symmetric matrices, J. Comput. Phys, 1975, 17, 87-94, https://doi.org/10.1016/0021-9991(75)90065-0