iterative-solver/Metric_8h_source.html

#ifndef LINEARALGEBRA_SRC_MOLPRO_LINALG_ITSOLV_METRIC_H

#define LINEARALGEBRA_SRC_MOLPRO_LINALG_ITSOLV_METRIC_H


namespace molpro::linalg::itsolv {


enum class MetricKind {

  Identity,

  HermitianPositiveDefinite,

  HermitianPositiveSemidefinite,

  HermitianIndefinite,

};


enum class MetricStorage {

  Stored,

  OnTheFly,

};


} // namespace molpro::linalg::itsolv


#endif // LINEARALGEBRA_SRC_MOLPRO_LINALG_ITSOLV_METRIC_H

molpro::linalg::itsolv
4-parameter interpolation of a 1-dimensional function given two points for which function values and ...
Definition helper.h:14

molpro::linalg::itsolv::MetricStorage
MetricStorage
How a solver obtains the actions of a metric on its subspace vectors, see IterativeSolver::set_metric...
Definition Metric.h:21

molpro::linalg::itsolv::MetricStorage::Stored
@ Stored
the actions of the metric on all subspace vectors are kept

molpro::linalg::itsolv::MetricStorage::OnTheFly
@ OnTheFly
the metric is applied to the solutions whenever residuals are constructed

molpro::linalg::itsolv::MetricKind
MetricKind
The kind of metric M of a generalised problem, such as the eigenproblem A v = lambda M v.
Definition Metric.h:13

molpro::linalg::itsolv::MetricKind::HermitianPositiveSemidefinite
@ HermitianPositiveSemidefinite
Hermitian and positive semidefinite, i.e. possibly singular.

molpro::linalg::itsolv::MetricKind::HermitianPositiveDefinite
@ HermitianPositiveDefinite
Hermitian and positive definite, e.g. the overlap matrix of a non-orthogonal basis.

molpro::linalg::itsolv::MetricKind::HermitianIndefinite
@ HermitianIndefinite
Hermitian and indefinite, e.g. in RPA, TDHF or Bethe-Salpeter equations.

molpro::linalg::itsolv::MetricKind::Identity
@ Identity
M = 1, i.e. no metric.