itpp::GF2mat_sparse_alist Class Reference

Parameterized "alist" representation of sparse GF(2) matrix. More...

#include <itpp/base/gf2mat.h>

Public Member Functions
	GF2mat_sparse_alist ()
	Default constructor.
	GF2mat_sparse_alist (const std::string &fname)
	Constructor, which reads alist data from a file named fname.
void	read (const std::string &fname)
	Read alist data from a file named fname.
void	write (const std::string &fname) const
	Write alist data to a file named fname.
GF2mat_sparse	to_sparse (bool transpose=false) const
	Convert "alist" representation to GF2mat_sparse.
void	from_sparse (const GF2mat_sparse &mat, bool transpose=false)
	Import "alist" representation from GF2mat_sparse.

Protected Attributes
bool	data_ok
	Flag indicating that "alist" matrix data are properly set.
int	M
	Size of the matrix: M rows x N columns.
int	N
	Size of the matrix: M rows x N columns.
imat	mlist
	List of integer coordinates in the m direction with non-zero entries.
imat	nlist
	List of integer coordinates in the n direction with non-zero entries.
ivec	num_mlist
	Weight of each row m.
ivec	num_nlist
	Weight of each column n.
int	max_num_m
	Maximum weight of rows.
int	max_num_n
	Maximum weight of columns.

Detailed Description

Parameterized "alist" representation of sparse GF(2) matrix.

Author

Adam Piatyszek and Erik G. Larsson

This class is used to provide a parameterized representation of a GF2mat_sparse class. The format is compatible with the "alist" format defined by David MacKay, Matthew Davey and John Lafferty:

• http://www.inference.phy.cam.ac.uk/mackay/codes/alist.html

For examples of "alist" representation visit David MacKay's Encyclopedia of Sparse Graph Codes:

• http://www.inference.phy.cam.ac.uk/mackay/codes/data.html

Definition at line 98 of file gf2mat.h.

Member Function Documentation

GF2mat_sparse itpp::GF2mat_sparse_alist::to_sparse

(

bool

transpose = false

)

const

Convert "alist" representation to GF2mat_sparse.

Parameters

transpose

Indicates whether a matrix should be transposed during the conversion process

Definition at line 193 of file gf2mat.cpp.

References itpp::Sparse_Mat< T >::compact(), M, max_num_m, mlist, N, num_mlist, itpp::Sparse_Mat< T >::set_new(), and itpp::Sparse_Mat< T >::transpose().

Referenced by itpp::LDPC_Parity::import_alist().

void itpp::GF2mat_sparse_alist::from_sparse	(	const GF2mat_sparse &	mat,
		bool	transpose = false
	)

Import "alist" representation from GF2mat_sparse.

Parameters

mat	Matrix to import
transpose	Indicates whether a matrix should be transposed during the conversion process

Definition at line 217 of file gf2mat.cpp.

References itpp::Sparse_Mat< T >::cols(), itpp::concat(), data_ok, itpp::Sparse_Mat< T >::get_col(), M, itpp::max(), max_num_m, max_num_n, mlist, N, nlist, num_mlist, num_nlist, itpp::Sparse_Mat< T >::rows(), and itpp::Sparse_Mat< T >::transpose().

Referenced by itpp::LDPC_Parity::export_alist().

---

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

• itpp/base/gf2mat.h
• itpp/base/gf2mat.cpp