syten::Krylov::SolverPolicies::Exponential Class Reference

Policy class to solve the Krylov problem and calculate \( \mathrm{exp}(t H) |\psi\rangle \) given a Krylov space, a timestep t and if necessary an initial norm. More...

#include <solver_policies.h>

Inheritance diagram for syten::Krylov::SolverPolicies::Exponential:

Collaboration diagram for syten::Krylov::SolverPolicies::Exponential:

Public Member Functions
SRDef	sp_convergence (DenseTensor< 2, SDef > mat, SDef _idt)
	Returns the change in coefficients between the last call and the current call with the new matrix. More...
template<typename Vec >
auto	sp_result (std::vector< Vec > const &krylov, SRDef initialnorm, SDef _idt) const
	Calculates \( \mathrm{exp}(t H) |\psi\rangle \) where \( |\psi \rangle \) is taken as the first element of krylov multiplied by its initial norm initialnorm and t = _idt. More...
template<typename... Unused>
void	sp_wrapup (Unused &&...)
	Unused dummy implementation. More...

Static Protected Member Functions
static DenseTensor< 1, SDef >	get_coeffs (DenseTensor< 2, SDef > mat, SDef _idt)
	Given a dense matrix mat and a coefficient _idt, attempts to calculate the coefficients of the basis vectors to sum up to \( \mathrm{exp}( \mathtt{_idt} H) |e_0\rangle \). More...

Private Attributes
DenseTensor< 1, SDef >	memoizedCoeffs
	Coefficients calculated during previous call. More...
SDef	memoizedPrefactor = NAN
	Coefficient t used during previous call. More...

Detailed Description

Policy class to solve the Krylov problem and calculate \( \mathrm{exp}(t H) |\psi\rangle \) given a Krylov space, a timestep t and if necessary an initial norm.

The timestep t is transported in the solver-dependent parameter.

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

• inc/alg/solver_policies.h