#include <Sobject.h>

Public Member Functions
	Sobject (const int index, SyBookkeeper *denBK)
	Constructor. More...

virtual	~Sobject ()
	Destructor.

int	gNKappa () const
	Get the number of symmetry blocks. More...

double *	gStorage ()
	Get the pointer to the storage. More...

int	gKappa (const int NL, const int TwoSL, const int IL, const int N1, const int N2, const int TwoJ, const int NR, const int TwoSR, const int IR) const
	Get the index corresponding to a certain symmetry block. More...

int	gKappa2index (const int kappa) const
	Get the storage jump corresponding to a certain symmetry block. More...

double *	gStorage (const int NL, const int TwoSL, const int IL, const int N1, const int N2, const int TwoJ, const int NR, const int TwoSR, const int IR)
	Get the pointer to the storage of a certain symmetry block. More...

int	gIndex () const
	Get the location index. More...

void	Join (TensorT Tleft, TensorT Tright)
	Join two sites to form a composite S-object. More...

double	Split (TensorT Tleft, TensorT Tright, const int virtualdimensionD, const bool movingright, const bool change)
	SVD an S-object into 2 TensorT's. More...

void	addNoise (const double NoiseLevel)
	Add noise to the current S-object. More...

void	prog2symm ()
	Convert the storage from diagram convention to symmetric Hamiltonian convention.

void	symm2prog ()
	Convert the storage from symmetric Hamiltonian convention to diagram convention.

int	gNL (const int ikappa) const
	Get the left particle number symmetry of block ikappa. More...

int	gTwoSL (const int ikappa) const
	Get the left spin symmetry of block ikappa. More...

int	gIL (const int ikappa) const
	Get the left irrep symmetry of block ikappa. More...

int	gN1 (const int ikappa) const
	Get the left local particle number symmetry of block ikappa. More...

int	gN2 (const int ikappa) const
	Get the right local particle number symmetry of block ikappa. More...

int	gTwoJ (const int ikappa) const
	Get the central spin symmetry of block ikappa. More...

int	gNR (const int ikappa) const
	Get the right particle number symmetry of block ikappa. More...

int	gTwoSR (const int ikappa) const
	Get the right spin symmetry of block ikappa. More...

int	gIR (const int ikappa) const
	Get the right irrep symmetry of block ikappa. More...

int	gReorder (const int ikappa) const
	Get the blocks from large to small: blocksize(reorder[i])>=blocksize(reorder[i+1]) More...

Detailed Description

Sobject class.

Author: Sebastian Wouters sebas.nosp@m.tian.nosp@m.woute.nosp@m.rs@g.nosp@m.mail..nosp@m.com

Date: February 18, 2013

Handles the storage of a spin-coupled two-site object, as is needed for the effective Hamiltonian DMRG equations. Extra functionalities are:

the formation of an S-object out of two neighbouring TensorT's
the decomposition into two TensorT's

Definition at line 34 of file Sobject.h.

Constructor & Destructor Documentation

CheMPS2::Sobject::Sobject	(	const int	index,
		SyBookkeeper *	denBK
	)

Constructor.

Parameters

index	The first index ( S spans index & index + 1 ).
denBK	Contains the virtual dimensions. Not constant as Sobject is allowed to set the virtual dimensions of symmetry sectors based on the Schmidt spectrum.

Definition at line 36 of file Sobject.cpp.

Here is the call graph for this function:

Member Function Documentation

void CheMPS2::Sobject::addNoise ( const double NoiseLevel )

Add noise to the current S-object.

Parameters

NoiseLevel The noise added to the S-object is of size (-0.5 < random number < 0.5) * NoiseLevel / infinity-norm(gStorage())

Definition at line 650 of file Sobject.cpp.

Here is the call graph for this function:

Here is the caller graph for this function:

int CheMPS2::Sobject::gIL ( const int ikappa ) const

Get the left irrep symmetry of block ikappa.

Parameters

ikappa The tensor block number

Returns: the left irrep symmetry of block ikappa

Definition at line 204 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gIndex ( ) const

Get the location index.

Returns: the index

Definition at line 200 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gIR ( const int ikappa ) const

Get the right irrep symmetry of block ikappa.

Parameters

ikappa The tensor block number

Returns: the right irrep symmetry of block ikappa

Definition at line 210 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gKappa	(	const int	NL,
		const int	TwoSL,
		const int	IL,
		const int	N1,
		const int	N2,
		const int	TwoJ,
		const int	NR,
		const int	TwoSR,
		const int	IR
	)		const

Get the index corresponding to a certain symmetry block.

Parameters

NL	The left particle number sector
TwoSL	The left spin symmetry sector
IL	The left irrep sector
N1	The first site particle number sector
N2	The second site particle number sector
TwoJ	The recoupled two-site spin symmetry sector
NR	The right particle number sector
TwoSR	The right spin symmetry sector
IR	The right irrep sector

Returns: The kappa corresponding to the input parameters; -1 means no such block

Definition at line 172 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gKappa2index ( const int kappa ) const

Get the storage jump corresponding to a certain symmetry block.

Parameters

kappa The symmetry block

Returns: kappa2index[kappa], the memory jumper to a certain block

Definition at line 190 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gN1 ( const int ikappa ) const

Get the left local particle number symmetry of block ikappa.

Parameters

ikappa The tensor block number

Returns: the left local particle number symmetry of block ikappa

Definition at line 205 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gN2 ( const int ikappa ) const

Get the right local particle number symmetry of block ikappa.

Parameters

ikappa The tensor block number

Returns: the right local particle number symmetry of block ikappa

Definition at line 206 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gNKappa ( ) const

Get the number of symmetry blocks.

Returns: The number of symmetry blocks

Definition at line 166 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gNL ( const int ikappa ) const

Get the left particle number symmetry of block ikappa.

Parameters

ikappa The tensor block number

Returns: the left particle number symmetry of block ikappa

Definition at line 202 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gNR ( const int ikappa ) const

Get the right particle number symmetry of block ikappa.

Parameters

ikappa The tensor block number

Returns: the right particle number symmetry of block ikappa

Definition at line 208 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gReorder ( const int ikappa ) const

Get the blocks from large to small: blocksize(reorder[i])>=blocksize(reorder[i+1])

Parameters

ikappa The index which counts from large to small

Returns: The original block index

Definition at line 170 of file Sobject.cpp.

Here is the caller graph for this function:

double * CheMPS2::Sobject::gStorage ( )

Get the pointer to the storage.

return pointer to the storage

Definition at line 168 of file Sobject.cpp.

Here is the caller graph for this function:

double * CheMPS2::Sobject::gStorage	(	const int	NL,
		const int	TwoSL,
		const int	IL,
		const int	N1,
		const int	N2,
		const int	TwoJ,
		const int	NR,
		const int	TwoSR,
		const int	IR
	)

Get the pointer to the storage of a certain symmetry block.

Parameters

NL	The left particle number sector
TwoSL	The left spin symmetry sector
IL	The left irrep sector
N1	The first site particle number sector
N2	The second site particle number sector
TwoJ	The recoupled two-site spin symmetry sector
NR	The right particle number sector
TwoSR	The right spin symmetry sector
IR	The right irrep sector

Returns: Pointer to the requested block; NULL means no such block ( kappa == -1 )

Definition at line 192 of file Sobject.cpp.

Here is the call graph for this function:

int CheMPS2::Sobject::gTwoJ ( const int ikappa ) const

Get the central spin symmetry of block ikappa.

Parameters

ikappa The tensor block number

Returns: the central spin symmetry of block ikappa

Definition at line 207 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gTwoSL ( const int ikappa ) const

Get the left spin symmetry of block ikappa.

Parameters

ikappa The tensor block number

Returns: the left spin symmetry of block ikappa

Definition at line 203 of file Sobject.cpp.

Here is the caller graph for this function:

int CheMPS2::Sobject::gTwoSR ( const int ikappa ) const

Get the right spin symmetry of block ikappa.

Parameters

ikappa The tensor block number

Returns: the right spin symmetry of block ikappa

Definition at line 209 of file Sobject.cpp.

Here is the caller graph for this function:

void CheMPS2::Sobject::Join	(	TensorT *	Tleft,
		TensorT *	Tright
	)

Join two sites to form a composite S-object.

Parameters

Tleft	Left TensorT to form the composite S-object
Tright	Right TensorT to form the composite S-object

Definition at line 212 of file Sobject.cpp.

Here is the call graph for this function:

Here is the caller graph for this function:

double CheMPS2::Sobject::Split	(	TensorT *	Tleft,
		TensorT *	Tright,
		const int	virtualdimensionD,
		const bool	movingright,
		const bool	change
	)

SVD an S-object into 2 TensorT's.

Parameters

Tleft	Left TensorT storage space. At output left normalized.
Tright	Right TensorT storage space. At output right normalized.
virtualdimensionD	The virtual dimension which is partitioned over the different symmetry blocks based on the Schmidt spectrum
movingright	When true, the singular values are multiplied into V^T, when false, into U.
change	Whether or not the symmetry virtual dimensions are allowed to change (when false: D doesn't matter)

Returns: the discarded weight if change==true ; else 0.0

Definition at line 260 of file Sobject.cpp.

Here is the call graph for this function:

Here is the caller graph for this function:

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

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation