IO for matrices and vectors.

Provides methods for reading and writing matrices and vectors in various formats. More...

Files
file	io.hh
	Some generic functions for pretty printing vectors and matrices.
file	matrixmarket.hh
	Provides classes for reading and writing MatrixMarket Files with an extension for parallel matrices.

Functions
template<class V >
void	Dune::recursive_printvector (std::ostream &s, const V &v, std::string rowtext, int &counter, int columns, int width)
	Recursively print a vector. More...
template<class V >
void	Dune::printvector (std::ostream &s, const V &v, std::string title, std::string rowtext, int columns=1, int width=10, int precision=2)
	Print an ISTL vector. More...
void	Dune::fill_row (std::ostream &s, int m, int width, int precision)
	Print a row of zeros for a non-existing block. More...
template<class K >
void	Dune::print_row (std::ostream &s, const K &value, typename FieldMatrix< K, 1, 1 >::size_type I, typename FieldMatrix< K, 1, 1 >::size_type J, typename FieldMatrix< K, 1, 1 >::size_type therow, int width, int precision, typename std::enable_if_t< Dune::IsNumber< K >::value > *sfinae=nullptr)
	Print one row of a matrix, specialization for number types. More...
template<class M >
void	Dune::print_row (std::ostream &s, const M &A, typename M::size_type I, typename M::size_type J, typename M::size_type therow, int width, int precision, typename std::enable_if_t<!Dune::IsNumber< M >::value > *sfinae=nullptr)
	Print one row of a matrix. More...
template<class M >
void	Dune::printmatrix (std::ostream &s, const M &A, std::string title, std::string rowtext, int width=10, int precision=2)
	Print a generic block matrix. More...
template<class B , int n, int m, class A >
void	Dune::printSparseMatrix (std::ostream &s, const BCRSMatrix< FieldMatrix< B, n, m >, A > &mat, std::string title, std::string rowtext, int width=3, int precision=2)
	Prints a BCRSMatrix with fixed sized blocks. More...
template<class FieldType >
void	Dune::writeMatrixToMatlabHelper (const FieldType &value, int rowOffset, int colOffset, std::ostream &s, typename std::enable_if_t< Dune::IsNumber< FieldType >::value > *sfinae=nullptr)
	Helper method for the writeMatrixToMatlab routine. More...
template<class MatrixType >
void	Dune::writeMatrixToMatlabHelper (const MatrixType &matrix, int externalRowOffset, int externalColOffset, std::ostream &s, typename std::enable_if_t<!Dune::IsNumber< MatrixType >::value > *sfinae=nullptr)
	Helper method for the writeMatrixToMatlab routine. More...
template<class MatrixType >
void	Dune::writeMatrixToMatlab (const MatrixType &matrix, const std::string &filename, int outputPrecision=18)
	Writes sparse matrix in a Matlab-readable format. More...
template<class VectorType >
void	Dune::writeVectorToMatlab (const VectorType &vector, const std::string &filename, int outputPrecision=18)
	Writes vectors in a Matlab-readable format. More...
template<typename T , typename A >
void	Dune::readMatrixMarket (Dune::BlockVector< T, A > &vector, std::istream &istr)
	Reads a BlockVector from a matrix market file. More...
template<typename T , typename A >
void	Dune::readMatrixMarket (Dune::BCRSMatrix< T, A > &matrix, std::istream &istr)
	Reads a sparse matrix from a matrix market file. More...
template<typename M >
void	Dune::writeMatrixMarket (const M &matrix, std::ostream &ostr)
	writes a ISTL matrix or vector to a stream in matrix market format.
template<typename M >
void	Dune::storeMatrixMarket (const M &matrix, std::string filename, int prec=default_precision)
	Stores a parallel matrix/vector in matrix market format in a file. More...
template<typename M , typename G , typename L >
void	Dune::storeMatrixMarket (const M &matrix, std::string filename, const OwnerOverlapCopyCommunication< G, L > &comm, bool storeIndices=true, int prec=default_precision)
	Stores a parallel matrix/vector in matrix market format in a file. More...
template<typename M , typename G , typename L >
void	Dune::loadMatrixMarket (M &matrix, const std::string &filename, OwnerOverlapCopyCommunication< G, L > &comm, bool readIndices=true)
	Load a parallel matrix/vector stored in matrix market format. More...
template<typename M >
void	Dune::loadMatrixMarket (M &matrix, const std::string &filename)
	Load a matrix/vector stored in matrix market format. More...

Detailed Description

Provides methods for reading and writing matrices and vectors in various formats.

Routine printmatrix prints a (sparse matrix with all entries (even zeroes). Function printvector prints a vector to a stream. PrintSparseMatrix prints a sparse matrix omitting all nonzeroes. With writeMatrixToMatlab one can write a matrix in a Matlab readable format. Using storeMartrixMarket and loadMatrixMarket one can store and load a parallel ISTL matrix in MatrixMarket format. The latter can even read a matrix written with writeMatrixToMatlab.

Function Documentation

fill_row()

void Dune::fill_row ( std::ostream &  s, int  m, int  width, int  precision  )

inline

Print a row of zeros for a non-existing block.

#include <dune/istl/io.hh>

loadMatrixMarket() [1/2]

template<typename M >

void Dune::loadMatrixMarket	(	M &	matrix,
		const std::string &	filename
	)

Load a matrix/vector stored in matrix market format.

More about the matrix market exchange format can be found here.

Parameters

matrix	Where to store the matrix/vector.
filename	the name of the filename (without suffix and rank!) rank i will read the file filename_i.mm

References DUNE_THROW, and Dune::readMatrixMarket().

loadMatrixMarket() [2/2]

template<typename M , typename G , typename L >

void Dune::loadMatrixMarket	(	M &	matrix,
		const std::string &	filename,
		OwnerOverlapCopyCommunication< G, L > &	comm,
		bool	readIndices = true
	)

Load a parallel matrix/vector stored in matrix market format.

More about the matrix market exchange format can be found here.

Parameters

matrix	Where to store the matrix/vector.
filename	the name of the filename (without suffix and rank!) rank i will read the file filename_i.mm
comm	The information about the data distribution.
readIndices	Whether to read the parallel index information. If true rank i reads the index information form file filename_i.idx And builds the remote indices information.

print_row() [1/2]

template<class K >

void Dune::print_row	(	std::ostream &	s,
		const K &	value,
		typename FieldMatrix< K, 1, 1 >::size_type	I,
		typename FieldMatrix< K, 1, 1 >::size_type	J,
		typename FieldMatrix< K, 1, 1 >::size_type	therow,
		int	width,
		int	precision,
		typename std::enable_if_t< Dune::IsNumber< K >::value > *	sfinae = nullptr
	)

Print one row of a matrix, specialization for number types.

#include <dune/istl/io.hh>

print_row() [2/2]

template<class M >

void Dune::print_row	(	std::ostream &	s,
		const M &	A,
		typename M::size_type	I,
		typename M::size_type	J,
		typename M::size_type	therow,
		int	width,
		int	precision,
		typename std::enable_if_t<!Dune::IsNumber< M >::value > *	sfinae = nullptr
	)

Print one row of a matrix.

#include <dune/istl/io.hh>

printmatrix()

template<class M >

void Dune::printmatrix	(	std::ostream &	s,
		const M &	A,
		std::string	title,
		std::string	rowtext,
		int	width = 10,
		int	precision = 2
	)

Print a generic block matrix.

#include <dune/istl/io.hh>

Bug:

Empty rows and columns are omitted by this method. (FlySpray #7)

Examples

recipe-linear-system-assembly.cc.

printSparseMatrix()

template<class B , int n, int m, class A >

void Dune::printSparseMatrix	(	std::ostream &	s,
		const BCRSMatrix< FieldMatrix< B, n, m >, A > &	mat,
		std::string	title,
		std::string	rowtext,
		int	width = 3,
		int	precision = 2
	)

Prints a BCRSMatrix with fixed sized blocks.

#include <dune/istl/io.hh>

Only the nonzero entries will be printed as matrix blocks together with their corresponding column index and all others will be omitted.

This might be preferable over printmatrix in the case of big sparse matrices with nonscalar blocks.

Parameters

s	The ostream to print to.
mat	The matrix to print.
title	The title for the matrix.
rowtext	The text to prepend to each print out of a matrix row.
width	The number of nonzero blocks to print in one line.
precision	The precision to use when printing the numbers.

printvector()

template<class V >

void Dune::printvector	(	std::ostream &	s,
		const V &	v,
		std::string	title,
		std::string	rowtext,
		int	columns = 1,
		int	width = 10,
		int	precision = 2
	)

Print an ISTL vector.

#include <dune/istl/io.hh>

Examples

recipe-linear-system-assembly.cc, recipe-linear-system-solution-istl.cc, and recipe-linear-system-solution-pdelab.cc.

References Dune::recursive_printvector().

readMatrixMarket() [1/2]

template<typename T , typename A >

void Dune::readMatrixMarket	(	Dune::BCRSMatrix< T, A > &	matrix,
		std::istream &	istr
	)

Reads a sparse matrix from a matrix market file.

Parameters

matrix	The matrix to store the data in.
istr	The input stream to read the data from.

Warning

Not all formats are supported!

readMatrixMarket() [2/2]

template<typename T , typename A >

void Dune::readMatrixMarket	(	Dune::BlockVector< T, A > &	vector,
		std::istream &	istr
	)

Reads a BlockVector from a matrix market file.

Parameters

vector	The vector to store the data in.
istr	The input stream to read the data from.

Warning

Not all formats are supported!

References DUNE_THROW.

Referenced by Dune::loadMatrixMarket().

recursive_printvector()

template<class V >

void Dune::recursive_printvector	(	std::ostream &	s,
		const V &	v,
		std::string	rowtext,
		int &	counter,
		int	columns,
		int	width
	)

Recursively print a vector.

#include <dune/istl/io.hh>

References Dune::recursive_printvector().

Referenced by Dune::printvector(), and Dune::recursive_printvector().

storeMatrixMarket() [1/2]

template<typename M , typename G , typename L >

void Dune::storeMatrixMarket	(	const M &	matrix,
		std::string	filename,
		const OwnerOverlapCopyCommunication< G, L > &	comm,
		bool	storeIndices = true,
		int	prec = default_precision
	)

Stores a parallel matrix/vector in matrix market format in a file.

More about the matrix market exchange format can be found here.

Parameters

matrix	The matrix/vector to store.
filename	the name of the filename (without suffix and rank!) rank i will write the file filename_i.mm
comm	The information about the data distribution.
storeIndices	Whether to store the parallel index information. If true rank i writes the index information to file filename_i.idx.
prec	Set the decimal precision to be used

References Dune::ParallelIndexSet< TG, TL, N >::begin(), Dune::dverb, Dune::ParallelIndexSet< TG, TL, N >::end(), Dune::OwnerOverlapCopyCommunication< GlobalIdType, LocalIdType >::indexSet(), and Dune::OwnerOverlapCopyCommunication< GlobalIdType, LocalIdType >::remoteIndices().

storeMatrixMarket() [2/2]

template<typename M >

void Dune::storeMatrixMarket	(	const M &	matrix,
		std::string	filename,
		int	prec = default_precision
	)

Stores a parallel matrix/vector in matrix market format in a file.

More about the matrix market exchange format can be found here.

Parameters

matrix	The matrix/vector to store.
filename	the name of the filename (without suffix and rank!) rank i will write the file filename_i.mm
prec	Set the decimal precision to be used

writeMatrixToMatlab()

template<class MatrixType >

void Dune::writeMatrixToMatlab	(	const MatrixType &	matrix,
		const std::string &	filename,
		int	outputPrecision = 18
	)

Writes sparse matrix in a Matlab-readable format.

#include <dune/istl/io.hh>

This routine writes the argument BCRSMatrix to a file with the name given by the filename argument. The file format is ASCII, with no header, and three data columns. Each row describes a scalar matrix entry and consists of the matrix row and column numbers (both counted starting from 1), and the matrix entry. Such a file can be read from Matlab using the command

new_mat = spconvert(load('filename'));

Parameters

matrix	reference to matrix
filename
outputPrecision	(number of digits) which is used to write the output file

References Dune::writeMatrixToMatlabHelper().

writeMatrixToMatlabHelper() [1/2]

template<class FieldType >

void Dune::writeMatrixToMatlabHelper	(	const FieldType &	value,
		int	rowOffset,
		int	colOffset,
		std::ostream &	s,
		typename std::enable_if_t< Dune::IsNumber< FieldType >::value > *	sfinae = nullptr
	)

Helper method for the writeMatrixToMatlab routine.

#include <dune/istl/io.hh>

This specialization for numbers ends the recursion

Referenced by Dune::writeMatrixToMatlab(), and Dune::writeMatrixToMatlabHelper().

writeMatrixToMatlabHelper() [2/2]

template<class MatrixType >

void Dune::writeMatrixToMatlabHelper	(	const MatrixType &	matrix,
		int	externalRowOffset,
		int	externalColOffset,
		std::ostream &	s,
		typename std::enable_if_t<!Dune::IsNumber< MatrixType >::value > *	sfinae = nullptr
	)

Helper method for the writeMatrixToMatlab routine.

#include <dune/istl/io.hh>

References Dune::writeMatrixToMatlabHelper().

writeVectorToMatlab()

template<class VectorType >

void Dune::writeVectorToMatlab	(	const VectorType &	vector,
		const std::string &	filename,
		int	outputPrecision = 18
	)

Writes vectors in a Matlab-readable format.

#include <dune/istl/io.hh>

This routine writes the argument block vector to a file with the name given by the filename argument. The file format is ASCII, with no header, and a single data column. Such a file can be read from Matlab using the command

new_vec = load('filename');

Parameters

vector	reference to vector to be printed to output file
filename	filename of output file
outputPrecision	(number of digits) which is used to write the output file