mpsgen Class Reference

Output module for writing MPS files. More...

#include <mpsgen.hh>

Inheritance diagram for mpsgen:

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Collaboration diagram for mpsgen:

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List of all members.

Public Member Functions
	mpsgen (const driver &d)
	Constructor.
virtual	~mpsgen ()
	Destructor.
void	write (const char *filename)
	Write output to named file.
Protected Member Functions
void	make_matrix (size_t rows, size_t cols)
	Allocates a CoinPackedMatrix data structure.
void	set_element (size_t row, size_t col, int val)
	Set a single matrix element.
Private Attributes
CoinPackedMatrix *	matrix
	COIN-OR matrix representation.

Detailed Description

Output module for writing MPS files.

The MPS file format is commonly used as input format for linear optimization software. Descriptions can be found on the web. This class uses the CoinUtils library to write output in this format.

Definition at line 39 of file mpsgen.hh.

Constructor & Destructor Documentation

mpsgen::mpsgen ( const driver & d )

Constructor.

The mpsgen::matrix element will be constructed in mpsgen::make_matrix(), not in the constructor.

Definition at line 42 of file mpsgen.cc.

mpsgen::~mpsgen ( ) [virtual]

Destructor.

Deletes mpsgen::matrix if it has been created. As mipgen::~mipgen is a virtual destructor, this destructor will get called even if the object is referenced through a pointer to mipgen.

Definition at line 52 of file mpsgen.cc.

References matrix.

Member Function Documentation

void mpsgen::make_matrix	(	size_t	rows,
		size_t	cols
	)			`[protected, virtual]`

Allocates a CoinPackedMatrix data structure.

Parameters:

	rows	the number of rows the coefficient matrix has.
	cols	the number of columns the coefficient matrix has.

Reimplemented from mipgen.

Definition at line 108 of file mpsgen.cc.

References matrix, and CoinPackedMatrix::setDimensions().

void mpsgen::set_element	(	size_t	row,
		size_t	col,
		int	val
	)			`[protected, virtual]`

Set a single matrix element.

This implementation skips zero elements. Nonzero elements will be stored in the matrix.

Parameters:

	row	the row index of the matrix element.
	col	the column index of the matrix element.
	val	the value of the matrix element.

Reimplemented from mipgen.

Definition at line 124 of file mpsgen.cc.

References matrix, and CoinPackedMatrix::modifyCoefficient().

void mpsgen::write ( const char * filename ) [virtual]

Write output to named file.

Bounds are set using operations on the CoinPackedMatrix. Then the problem is written to the specified file.

Bug:: Passing a 0 pointer as file name should result in the problem being written to standard output, but the current version of CoinUtils seems incapable of this, as it wants to append .mps to any file name not already ending with that extension.

Parameters:

filename

the file to which output will be written

Reimplemented from mipgen.

Definition at line 68 of file mpsgen.cc.

References mipgen::col_bounds, mipgen::col_names, mipgen::drv, CoinMpsIO::getInfinity(), matrix, mipgen::modcount, driver::name, mipgen::row_bounds, mipgen::row_names, CoinMpsIO::setMpsData(), CoinMpsIO::setProblemName(), and CoinMpsIO::writeMps().