Detailed Description

template<typename PivotMatrixType>
class DmrgJanitor< PivotMatrixType >

Base class for all the sweeping stuff. Needs to know PivotMatrixType because sweeps using DMRG::BROOM::RDM and DMRG::BROOM::RICH_SVD involve non-local information, i.e. knowledge of the transfer matrices and the Hamiltonian (given by PivotMatrix1).

Definition at line 28 of file DmrgJanitor.h.

#include <DmrgJanitor.h>

Inheritance diagram for DmrgJanitor< PivotMatrixType >:

[legend]

Public Member Functions
	DmrgJanitor ()

	DmrgJanitor (size_t L_input)

void	set_defaultCutoffs ()

void	set_pivot (int pivot_input)


void	sweep (size_t loc, DMRG::BROOM::OPTION TOOL, PivotMatrixType *H=NULL)

void	skim (DMRG::DIRECTION::OPTION DIR, DMRG::BROOM::OPTION TOOL, PivotMatrixType *H=NULL)

void	skim (DMRG::BROOM::OPTION TOOL, PivotMatrixType *H=NULL)

void	entropy_skim ()


void	sweepStep (DMRG::DIRECTION::OPTION DIR, size_t loc, DMRG::BROOM::OPTION TOOL, PivotMatrixType *H=NULL, bool DISCARD_U_or_V=false)

virtual void	rightSweepStep (size_t loc, DMRG::BROOM::OPTION TOOL, PivotMatrixType *H=NULL, bool DISCARD_V=false)

virtual void	leftSweepStep (size_t loc, DMRG::BROOM::OPTION TOOL, PivotMatrixType *H=NULL, bool DISCARD_U=false)


size_t	length () const

Public Attributes

double	eps_svd

double	eps_truncWeight

double	alpha_rsvd

size_t	max_Nsv

size_t	min_Nsv

int	max_Nrich

Protected Attributes

int	pivot = -1

size_t	N_sites

Constructor & Destructor Documentation

◆ DmrgJanitor() [1/2]

template<typename PivotMatrixType >

DmrgJanitor< PivotMatrixType >::DmrgJanitor

Definition at line 117 of file DmrgJanitor.h.

◆ DmrgJanitor() [2/2]

template<typename PivotMatrixType >

DmrgJanitor< PivotMatrixType >::DmrgJanitor ( size_t L_input )

Definition at line 124 of file DmrgJanitor.h.

Member Function Documentation

◆ entropy_skim()

template<typename PivotMatrixType >

void DmrgJanitor< PivotMatrixType >::entropy_skim

Like skim, but sets eps_svd temporarily to 0.

Definition at line 176 of file DmrgJanitor.h.

◆ leftSweepStep()

template<typename PivotMatrixType >

virtual void DmrgJanitor< PivotMatrixType >::leftSweepStep	(	size_t	loc,
		DMRG::BROOM::OPTION	TOOL,
		PivotMatrixType *	H = `NULL`,
		bool	DISCARD_U = `false`
	)

inlinevirtual

Core function for a sweep to the left. Just a virtual placeholder in DmrgJanitor, overwritten by Mps with the real code.

Parameters

loc	: Sweeps to the left from the site `loc`, updating the A-matrices at `loc` and `loc-1`, shifting the pivot to `loc-1`.
TOOL	: with which broom to sweep, see DMRG::BROOM::OPTION
H	: Non-local information for DMRG::BROOM::RDM and DMRG::BROOM::RICH_SVD enters thorugh here.
DISCARD_U	If `true`, don't multiply the U-matrix onto the next site

Reimplemented in Mps< Symmetry, Scalar >.

Definition at line 87 of file DmrgJanitor.h.

◆ length()

template<typename PivotMatrixType >

size_t DmrgJanitor< PivotMatrixType >::length ( ) const

inline

Returns the length of the chain.

Definition at line 92 of file DmrgJanitor.h.

◆ rightSweepStep()

template<typename PivotMatrixType >

virtual void DmrgJanitor< PivotMatrixType >::rightSweepStep	(	size_t	loc,
		DMRG::BROOM::OPTION	TOOL,
		PivotMatrixType *	H = `NULL`,
		bool	DISCARD_V = `false`
	)

inlinevirtual

Core function for a sweep to the right. Just a virtual placeholder in DmrgJanitor, overwritten by Mps with the real code.

Parameters

loc	: Sweeps to the right from the site `loc`, updating the A-matrices at `loc` and `loc+1`, shifting the pivot to `loc+1`.
TOOL	: with which broom to sweep, see DMRG::BROOM::OPTION
H	: Non-local information for DMRG::BROOM::RDM and DMRG::BROOM::RICH_SVD enters thorugh here.
DISCARD_V	If `true`, don't multiply the V-matrix onto the next site

Reimplemented in Mps< Symmetry, Scalar >.

Definition at line 78 of file DmrgJanitor.h.

◆ set_defaultCutoffs()

template<typename PivotMatrixType >

void DmrgJanitor< PivotMatrixType >::set_defaultCutoffs

Definition at line 132 of file DmrgJanitor.h.

◆ set_pivot()

template<typename PivotMatrixType >

void DmrgJanitor< PivotMatrixType >::set_pivot ( int pivot_input )

inline

Definition at line 104 of file DmrgJanitor.h.

◆ skim() [1/2]

template<typename PivotMatrixType >

void DmrgJanitor< PivotMatrixType >::skim	(	DMRG::BROOM::OPTION	TOOL,
		PivotMatrixType *	H = `NULL`
	)

Makes a full sweep to the opposite edge. Mainly useful for testing purposes. Asserts that the pivot is = 0 or = N_sites-1.

Parameters

TOOL	: with which broom to sweep, see DMRG::BROOM::OPTION
H	: Non-local information for DMRG::BROOM::RDM and DMRG::BROOM::RICH_SVD enters thorugh here.

Definition at line 160 of file DmrgJanitor.h.

◆ skim() [2/2]

template<typename PivotMatrixType >

void DmrgJanitor< PivotMatrixType >::skim	(	DMRG::DIRECTION::OPTION	DIR,
		DMRG::BROOM::OPTION	TOOL,
		PivotMatrixType *	H = `NULL`
	)

Makes a full sweep to the left or right. Mainly useful for testing purposes. Asserts that the pivot is =-1 or at the opposite edge.

Parameters

DIR	: If DMRG::DIRECTION::LEFT, sweeps to left. If DMRG::DIRECTION::RIGHT, sweeps to right.
TOOL	: with which broom to sweep, see DMRG::BROOM::OPTION
H	: Non-local information for DMRG::BROOM::RDM and DMRG::BROOM::RICH_SVD enters thorugh here.

Definition at line 144 of file DmrgJanitor.h.

◆ sweep()

template<typename PivotMatrixType >

void DmrgJanitor< PivotMatrixType >::sweep	(	size_t	loc,
		DMRG::BROOM::OPTION	TOOL,
		PivotMatrixType *	H = `NULL`
	)

Sweeps from pivot to a specific site. Mainly useful for testing purposes.

Parameters

loc	: pivot will go here
TOOL	: with which broom to sweep, see DMRG::BROOM::OPTION
H	: Non-local information for DMRG::BROOM::RDM and DMRG::BROOM::RICH_SVD enters thorugh here.

Definition at line 197 of file DmrgJanitor.h.

◆ sweepStep()

template<typename PivotMatrixType >

void DmrgJanitor< PivotMatrixType >::sweepStep	(	DMRG::DIRECTION::OPTION	DIR,
		size_t	loc,
		DMRG::BROOM::OPTION	TOOL,
		PivotMatrixType *	H = `NULL`,
		bool	DISCARD_U_or_V = `false`
	)

inline

Calls the next sweep step from site loc according to the direction DIR.

Definition at line 217 of file DmrgJanitor.h.

Member Data Documentation

◆ alpha_rsvd

template<typename PivotMatrixType >

double DmrgJanitor< PivotMatrixType >::alpha_rsvd

Cutoff criterion for DMRG::BROOM::OPTION.

Definition at line 97 of file DmrgJanitor.h.

◆ eps_svd

template<typename PivotMatrixType >

double DmrgJanitor< PivotMatrixType >::eps_svd

Cutoff criterion for DMRG::BROOM::OPTION.

Definition at line 97 of file DmrgJanitor.h.

◆ eps_truncWeight

template<typename PivotMatrixType >

double DmrgJanitor< PivotMatrixType >::eps_truncWeight

Cutoff criterion for DMRG::BROOM::OPTION.

Definition at line 97 of file DmrgJanitor.h.

◆ max_Nrich

template<typename PivotMatrixType >

int DmrgJanitor< PivotMatrixType >::max_Nrich

Cutoff criterion for DMRG::BROOM::OPTION.

Definition at line 99 of file DmrgJanitor.h.

◆ max_Nsv

template<typename PivotMatrixType >

size_t DmrgJanitor< PivotMatrixType >::max_Nsv

Cutoff criterion for DMRG::BROOM::OPTION.

Definition at line 98 of file DmrgJanitor.h.

◆ min_Nsv

template<typename PivotMatrixType >

size_t DmrgJanitor< PivotMatrixType >::min_Nsv

Cutoff criterion for DMRG::BROOM::OPTION.

Definition at line 98 of file DmrgJanitor.h.

◆ N_sites

template<typename PivotMatrixType >

size_t DmrgJanitor< PivotMatrixType >::N_sites

protected

Length of the chain.

Definition at line 112 of file DmrgJanitor.h.

◆ pivot

template<typename PivotMatrixType >

int DmrgJanitor< PivotMatrixType >::pivot = -1

protected

The pivot site (also called "orthogonality centre", but "pivot" is so much better). All matrices to the left are left-canonical $\sum_s {A^s}^\dag A^s=I$ , all matrices to the right are right-canonical $\sum_s B^s {B^s}^\dag=I$ . If pivot==-1, there is no orthogonality. Can be tested with Mps::test_ortho().

Definition at line 110 of file DmrgJanitor.h.

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

DmrgJanitor.h

Detailed Description

Public Member Functions

Public Attributes

Protected Attributes

Constructor & Destructor Documentation

◆ DmrgJanitor() [1/2]

◆ DmrgJanitor() [2/2]

Member Function Documentation

◆ entropy_skim()

◆ leftSweepStep()

◆ length()

◆ rightSweepStep()

◆ set_defaultCutoffs()

◆ set_pivot()

◆ skim() [1/2]

◆ skim() [2/2]

◆ sweep()

◆ sweepStep()

Member Data Documentation

◆ alpha_rsvd

◆ eps_svd

◆ eps_truncWeight

◆ max_Nrich

◆ max_Nsv

◆ min_Nsv

◆ N_sites

◆ pivot