state_wrappers.h File Reference

Wrappers around states and operators to work with the generic Lanczos algorithm. More...

#include <iostream>
#include <stdexcept>
#include <type_traits>
#include <vector>
#include "inc/util/persistent.h"
#include "inc/tensor/truncation.h"
#include "inc/util/converting_iterator.h"

Include dependency graph for state_wrappers.h:

This graph shows which files directly or indirectly include this file:

Classes
class	syten::Krylov::OperatorWrapper< Op >
	The OperatorWrapper class wraps a MPS/BTT operator, providing an interface complying to the exponentialLanczos template. More...
class	syten::Krylov::StateWrapper< StateT, TruncT >
	The StateWrapper class wraps a MPS/BTT-state to provide an interface complying to exponentialLanczos template. More...

Namespaces
	syten
	Syten namespace.
	syten::Krylov
	Krylov subspace methods.

Functions
template<typename Op >
auto	syten::Krylov::make_OperatorWrapper (Op &&o)
	make_OperatorWrapper simplifies OperatorWrapper construction by template type deduction More...
template<typename StateT , typename TruncT >
auto	syten::Krylov::make_StateWrapper (StateT &&state, TruncT &&trunc)
	make_StateWrapper simplifies StateWrapper construction by template type deduction More...
template<typename SType , typename TType >
SRDef	syten::Krylov::norm (StateWrapper< SType, TType > const &s)
	norm non-member norm function More...
template<typename SType , typename TType >
StateWrapper< SType, TType >	syten::Krylov::operator* (SDef prefactor, StateWrapper< SType, TType > const &s)
	operator * Multiplication of scalar w/ statewrapper. invokes StateWrapper::operator * More...
template<typename SType , typename TType , typename It >
void	syten::Krylov::orthogonalise_arithmetic (StateWrapper< SType, TType > &s, It first, It last, bool assume_norm_one=false)
template<typename SType , typename TType , typename It >
void	syten::Krylov::orthogonalise_variational (StateWrapper< SType, TType > &s, It first, It last)
template<typename SType , typename TType , typename It >
void	syten::Krylov::orthogonalise_variational_two_site (StateWrapper< SType, TType > &s, It first, It last)
template<typename SType , typename TType >
SDef	syten::Krylov::overlap (StateWrapper< SType, TType > const &a, StateWrapper< SType, TType > const &b)
	Overlap of two StateWrappers, first argument is complex-conjugated. More...

Detailed Description

Wrappers around states and operators to work with the generic Lanczos algorithm.

MPS/BTTS and MPO/BTTO in general support the operations necessary for a Lanczos algorithm to work, but require a thin wrapper to e.g. truncate states at the appropriate time and provide an interface to match the generic implementation.