GlpkBase Class Reference

Detailed Description

This class implements the common interface of the GLPK LP and MIP solver.

#include <lemon/glpk.h>

Inheritance diagram for GlpkBase:

Public Member Functions
_solver_bits::VoidPtr	lpx ()
	Pointer to the underlying GLPK data structure.
_solver_bits::VoidPtr	lpx () const
	Const pointer to the underlying GLPK data structure.
int	lpxRow (Row r) const
	Returns the constraint identifier understood by GLPK.
int	lpxCol (Col c) const
	Returns the variable identifier understood by GLPK.
void	write (std::string file, std::string format="MPS") const
	Write the problem or the solution to a file in the given format.
Public Member Functions inherited from LpBase
virtual	~LpBase ()
	Virtual destructor.
const char *	solverName () const
	Gives back the name of the solver.
Col	addCol ()
	Add a new empty column (i.e a new variable) to the LP.
template<class T >
int	addColSet (T &t)
	Adds several new columns (i.e variables) at once.
void	col (Col c, const DualExpr &e)
	Set a column (i.e a dual constraint) of the LP.
DualExpr	col (Col c) const
	Get a column (i.e a dual constraint) of the LP.
Col	addCol (const DualExpr &e, Value o=0)
	Add a new column to the LP.
Row	addRow ()
	Add a new empty row (i.e a new constraint) to the LP.
template<class T >
int	addRowSet (T &t)
	Add several new rows (i.e constraints) at once.
void	row (Row r, Value l, const Expr &e, Value u)
	Set a row (i.e a constraint) of the LP.
void	row (Row r, const Constr &c)
	Set a row (i.e a constraint) of the LP.
Expr	row (Row r) const
	Get a row (i.e a constraint) of the LP.
Row	addRow (Value l, const Expr &e, Value u)
	Add a new row (i.e a new constraint) to the LP.
Row	addRow (const Constr &c)
	Add a new row (i.e a new constraint) to the LP.
void	erase (Col c)
	Erase a column (i.e a variable) from the LP.
void	erase (Row r)
	Erase a row (i.e a constraint) from the LP.
std::string	colName (Col c) const
	Get the name of a column.
void	colName (Col c, const std::string &name)
	Set the name of a column.
Col	colByName (const std::string &name) const
	Get the column by its name.
std::string	rowName (Row r) const
	Get the name of a row.
void	rowName (Row r, const std::string &name)
	Set the name of a row.
Row	rowByName (const std::string &name) const
	Get the row by its name.
void	coeff (Row r, Col c, Value val)
	Set an element of the coefficient matrix of the LP.
Value	coeff (Row r, Col c) const
	Get an element of the coefficient matrix of the LP.
void	colLowerBound (Col c, Value value)
	Set the lower bound of a column (i.e a variable)
Value	colLowerBound (Col c) const
	Get the lower bound of a column (i.e a variable)
template<class T >
void	colLowerBound (T &t, Value value)
	Set the lower bound of several columns (i.e variables) at once.
void	colUpperBound (Col c, Value value)
	Set the upper bound of a column (i.e a variable)
Value	colUpperBound (Col c) const
	Get the upper bound of a column (i.e a variable)
template<class T >
void	colUpperBound (T &t, Value value)
	Set the upper bound of several columns (i.e variables) at once.
void	colBounds (Col c, Value lower, Value upper)
	Set the lower and the upper bounds of a column (i.e a variable)
template<class T >
void	colBounds (T &t, Value lower, Value upper)
	Set the lower and the upper bound of several columns (i.e variables) at once.
void	rowLowerBound (Row r, Value value)
	Set the lower bound of a row (i.e a constraint)
Value	rowLowerBound (Row r) const
	Get the lower bound of a row (i.e a constraint)
void	rowUpperBound (Row r, Value value)
	Set the upper bound of a row (i.e a constraint)
Value	rowUpperBound (Row r) const
	Get the upper bound of a row (i.e a constraint)
void	objCoeff (Col c, Value v)
	Set an element of the objective function.
Value	objCoeff (Col c) const
	Get an element of the objective function.
void	obj (const Expr &e)
	Set the objective function.
Expr	obj () const
	Get the objective function.
void	sense (Sense sense)
	Set the direction of optimization.
Sense	sense () const
	Query the direction of the optimization.
void	max ()
	Set the sense to maximization.
void	min ()
	Set the sense to maximization.
void	clear ()
	Clear the problem.
void	messageLevel (MessageLevel level)
	Set the message level of the solver.
void	write (std::string file, std::string format="MPS") const
	Write the problem to a file in the given format.

Additional Inherited Members
Public Types inherited from LpBase
enum	SolveExitStatus { SOLVED = 0, UNSOLVED = 1 }
	Possible outcomes of an LP solving procedure. More...
enum	Sense { MIN, MAX }
	Direction of the optimization. More...
enum	MessageLevel {   MESSAGE_NOTHING, MESSAGE_ERROR, MESSAGE_WARNING, MESSAGE_NORMAL,   MESSAGE_VERBOSE }
	Enum for messageLevel() parameter. More...
typedef double	Value
	The floating point type used by the solver.
Static Public Member Functions inherited from LpBase
static int	id (const Col &col)
	Returns the ID of the column.
static Col	colFromId (int id)
	Returns the column with the given ID.
static int	id (const Row &row)
	Returns the ID of the row.
static Row	rowFromId (int id)
	Returns the row with the given ID.
Static Public Attributes inherited from LpBase
static const Value	INF
	The infinity constant.
static const Value	NaN
	The not a number constant.

Member Function Documentation

void write ( std::string  file, std::string  format = "MPS"  ) const

inline

This function writes the problem or the solution to a file in the given format. Trying to write in an unsupported format will trigger LpBase::UnsupportedFormatError.

Parameters

file	The file path
format	The output file format. Supportted formats are "MPS" and "LP".