gko::solver::nullspace_traits< Solver > Struct Template Reference

Traits describing how an iterative solver handles the nullspaces given by the nullspace and left_nullspace factory parameters. More...

#include <ginkgo/core/solver/solver_base.hpp>

Static Public Attributes
static constexpr bool	is_supported = false
	Whether the solver removes the nullspaces. More...
static constexpr bool	requires_hermitian = false
	Whether the solver requires a Hermitian system matrix. More...
static constexpr bool	two_sided_projection = false
	Whether the solver needs the two-sided projection \( P M Q \) of its preconditioner \( M \), which is symmetric for symmetric problems (e.g. More...

Detailed Description

template<typename Solver>
struct gko::solver::nullspace_traits< Solver >

Traits describing how an iterative solver handles the nullspaces given by the nullspace and left_nullspace factory parameters.

Solvers that support them specialize this class.

Template Parameters

Solver

the solver type

Member Data Documentation

is_supported

template<typename Solver >

constexpr bool gko::solver::nullspace_traits< Solver >::is_supported = false

staticconstexpr

Whether the solver removes the nullspaces.

Other solvers throw NotSupported when a nullspace is set instead of ignoring it.

requires_hermitian

template<typename Solver >

constexpr bool gko::solver::nullspace_traits< Solver >::requires_hermitian = false

staticconstexpr

Whether the solver requires a Hermitian system matrix.

Then the left and right nullspace coincide, so setting either sets both.

two_sided_projection

template<typename Solver >

constexpr bool gko::solver::nullspace_traits< Solver >::two_sided_projection = false

staticconstexpr

Whether the solver needs the two-sided projection \( P M Q \) of its preconditioner \( M \), which is symmetric for symmetric problems (e.g.

for Minres). Otherwise, only the output of the preconditioner is projected, \( P M \).

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The documentation for this struct was generated from the following file:

• ginkgo/core/solver/solver_base.hpp