parse_operator.h File Reference

Operator parser for MPS lattices/MPO. More...

#include <stdexcept>
#include <stack>
#include "inc/util/scalars.h"
#include "inc/rep/rep_sector.h"
#include "inc/mps/lattice.h"
#include "inc/mps/operator.h"

Include dependency graph for parse_operator.h:

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

Classes
class	syten::MPS::ParseOperator::InvalidExpression
	Thrown when an invalid expression is encountered during MPS::Operator parsing. More...
class	syten::MPS::ParseOperator::NotDefinition
	Thrown when parse() gets a string that is not an operator definition of the form A:O More...
struct	syten::MPS::ParseOperator::StackElement
	One element of the parsing stack. More...

Namespaces
namespace	syten
	Syten namespace.
namespace	syten::MPS
	The namespace containing all MPS-related tools, classes and objects.
namespace	syten::MPS::ParseOperator
	Support classes and functions related to matrix product operator parsing.

Typedefs
typedef void(*	syten::MPS::ParseOperator::StackElementParser) (std::stack< StackElement > &stack, Lattice const &lat, Index const position, bool const truncate)
	Type of a function parsing one element of the supplied stack assuming the supplied lattice. More...

Enumerations
enum class	syten::MPS::ParseOperator::StackElementType { String , Sector , Number , Operator }
	Denotes the type of element stored on the stack. More...

Functions
StackElementParser	syten::MPS::ParseOperator::getFunction (std::string const &token)
	Return the function matching the token specified. More...
Operator	syten::MPS::parse (Lattice const &lat, std::string const &desc, bool truncate=true)
	Parse an operator description. More...
Operator	syten::MPS::parse (std::string const &desc, bool const truncate=true)
	Parse a lattice:operator description. More...
Functions implementing operations on the parsing stack
void	syten::MPS::ParseOperator::addF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Addition of two operators or two numbers: a_num b_num → a+b | a_opr b_opr → a+b More...
void	syten::MPS::ParseOperator::distributeF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Distributes the absolute value of a number evenly over the system size, multiplied into the identity operator. More...
void	syten::MPS::ParseOperator::dot_squareF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Squares an operator using dot(). More...
void	syten::MPS::ParseOperator::dotF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Scalar product of two operators in the vacuum quantum number sector: a_opr b_opr _dot → dot(a,b), calls dotqF() if top of stack is sector. More...
void	syten::MPS::ParseOperator::dotqF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Scalar product of two operators in the specified quantum number sector: a_opr b_opr q_sec → dot(a,b,q) More...
void	syten::MPS::ParseOperator::equiscaleF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const)
	Calls equiscale() on a MPO. More...
void	syten::MPS::ParseOperator::mult_squareF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Squares an operator using operator*. More...
void	syten::MPS::ParseOperator::multF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Multiply the two topmost elements: a_opr|a_num b_opr|b_num → a * b, a is applied first. More...
void	syten::MPS::ParseOperator::operatorF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Create a global operator from the topmost element: x_str|x_num|x_opr _o → x_opr More...
void	syten::MPS::ParseOperator::sectorF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Create a sector from the topmost element: x_str → x_sec More...
void	syten::MPS::ParseOperator::siteF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Create a single-site operator from the two topmost elements: a_str b_num _s → opr(a_b) More...
void	syten::MPS::ParseOperator::truncateF (std::stack< StackElement > &s, Lattice const &lat, Index const position, bool const truncate)
	Truncation of an operator. More...

Detailed Description

Operator parser for MPS lattices/MPO.