Sym Namespace Reference

Classes
struct	AltSpinSU2
struct	ChargeDn
struct	ChargeSU2
struct	ChargeU1
struct	ChargeUp
struct	ChargeZ2
struct	Momentum
class	S1xS2
struct	SpinSU2
struct	SpinU1
class	SU2
class	SUN
class	U0
class	U1
class	ZN

Enumerations
enum	KIND {   S , Salt , T , N ,   M , Nup , Ndn , Nparity ,   K , S , Salt , T ,   N , M , Nup , Ndn ,   Nparity , K }
enum	KIND {   S , Salt , T , N ,   M , Nup , Ndn , Nparity ,   K , S , Salt , T ,   N , M , Nup , Ndn ,   Nparity , K }

Functions
template<typename Symmetry >
std::string	format (qarray< Symmetry::Nq > qnum)
template<typename Scalar >
Scalar	phase (int q)
template<typename Symmetry >
std::vector< std::pair< typename Symmetry::qType, typename Symmetry::qType > >	split (const typename Symmetry::qType Q, const std::vector< typename Symmetry::qType > &ql, const std::vector< typename Symmetry::qType > qr)
template<typename Symmetry >
std::vector< std::pair< std::size_t, std::size_t > >	split (const typename Symmetry::qType Q, const std::vector< typename Symmetry::qType > &ql, const std::vector< typename Symmetry::qType > qr, bool INDEX)
void	initialize (int maxJ=1, std::string f_3j="", std::string f_6j="", std::string f_9j="")
void	finalize (bool PRINT_STATS=false)
template<std::size_t N, typename Scalar >
bool	operator== (const typename SUN< N, Scalar >::qType &lhs, const typename SUN< N, Scalar >::qType &rhs)

Enumeration Type Documentation

KIND [1/2]

enum Sym::KIND

Enumerator
S
Salt
T
N
M
Nup
Ndn
Nparity
K
S
Salt
T
N
M
Nup
Ndn
Nparity
K

Definition at line 110 of file DmrgTypedefs.h.

KIND [2/2]

enum Sym::KIND

Enumerator
S
Salt
T
N
M
Nup
Ndn
Nparity
K
S
Salt
T
N
M
Nup
Ndn
Nparity
K

Definition at line 13 of file functions.h.

Function Documentation

finalize()

void Sym::finalize

(

bool

PRINT_STATS = false

)

Definition at line 127 of file functions.h.

format()

template<typename Symmetry >

std::string Sym::format

(

qarray< Symmetry::Nq >

qnum

)

Returns a formatted string for qnum.

Template Parameters

Symmetry

: A class providing all relevant functions and infos that are determined by the Symmetry. Click here for more information.

Parameters

qnum	: quantum number for formatting.

Note

Uses the kind() function provided from Symmetry for deducing the correct format function.

Definition at line 23 of file functions.h.

initialize()

void Sym::initialize	(	int	maxJ = 1,
		std::string	f_3j = "",
		std::string	f_6j = "",
		std::string	f_9j = ""
	)

This routine initializes the relevant objects for the calculation of -symbols. The specific code varies from library to library:

1. GSL: Nothing to to do.
2. WIGXJPF: The tables for the prime factorization need to get build. The parameter maxJ is the maximum angular momentum. It should be chosen high enough. The required memory for the prime factorization table is negligible.
3. FASTWIGXJ: Same initialization as WIGXJPF for fallback to symbols which are not precomputed (maxJ). Additionaly the filenames to the precalculated symbols are required. f_3j for -symbol, f_6j for -symbol and f_9j for -symbol. For the creation of the precomputed values see manual http://fy.chalmers.se/subatom/fastwigxj/README. The precomputed symbols (especially 9j) can be quite large in memory. Therefore, this library should only be used when performance gains are clearly present.

Warning

The current initialize() method is for a single thread. WIGXJPF and FASTWIGXJ can both be used in multi-tread applications. The initialize function however needs to get adapted accordingly. The details can be found on the websites above.

Definition at line 110 of file functions.h.

operator==()

template<std::size_t N, typename Scalar >

bool Sym::operator==	(	const typename SUN< N, Scalar >::qType &	lhs,
		const typename SUN< N, Scalar >::qType &	rhs
	)

Definition at line 75 of file SUN.h.

phase()

template<typename Scalar >

Scalar Sym::phase

(

int

q

)

Definition at line 51 of file functions.h.

split() [1/2]

template<typename Symmetry >

std::vector< std::pair< typename Symmetry::qType, typename Symmetry::qType > > Sym::split	(	const typename Symmetry::qType	Q,
		const std::vector< typename Symmetry::qType > &	ql,
		const std::vector< typename Symmetry::qType >	qr
	)

Splits the quantum number Q into pairs q1,q2 with . q1 and q2 can take all values from the given parameters ql and qr, respectively.

Note

: Without specifying ql and qr, there exist infinity solutions.

Definition at line 64 of file functions.h.

split() [2/2]

template<typename Symmetry >

std::vector< std::pair< std::size_t, std::size_t > > Sym::split	(	const typename Symmetry::qType	Q,
		const std::vector< typename Symmetry::qType > &	ql,
		const std::vector< typename Symmetry::qType >	qr,
		bool	INDEX
	)

Definition at line 80 of file functions.h.