Sparse Matricies

Mapped Matrix

Description

The templated class mapped_matrix<T, F, A> is the base container adaptor for sparse matricies using element maps. For a (m xn)-dimensional sparse matrix and 0 < = i < m, 0 < = j < n the non-zero elements hi,j are mapped via (i x n + j) for row major orientation or via (i + j x m) for column major orientation to consecutive elements of the associative container, i.e. for elements k = mi1,j1 and k + 1 = mi2,j2 of the container holds i1 < i2 or (i1 = i2 and j1 < j2) with row major orientation or j1 < j2 or (j1 = j2 and i1 < i2) with column major orientation.

Example

#include <boost/numeric/ublas/matrix_sparse.hpp>
#include <boost/numeric/ublas/io.hpp>

int main () {
    using namespace boost::numeric::ublas;
    mapped_matrix<double> m (3, 3, 3 * 3);
    for (unsigned i = 0; i < m.size1 (); ++ i)
        for (unsigned j = 0; j < m.size2 (); ++ j)
            m (i, j) = 3 * i + j;
    std::cout << m << std::endl;
}

Definition

Defined in the header matrix_sparse.hpp.

Template parameters

Parameter Description Default

T

The type of object stored in the mapped matrix.

F

Functor describing the storage organization. [1]

row_major

A

The type of the adapted array. [2]

map_std<std::size_t, T>

Model of

Matrix .

Type requirements

None, except for those imposed by the requirements of Matrix .

Public base classes

matrix_container<mapped_matrix<T, F, A> >

Members

Member Description

mapped_matrix ()

Allocates a mapped_matrix that holds at most zero rows of zero elements.

mapped_matrix (size_type size1, size_type2, size_type non_zeros = 0)

Allocates a mapped_matrix that holds at most size1 rows of size2 elements.

mapped_matrix (const mapped_matrix &m)

The copy constructor.

template<class AE> mapped_matrix (size_type non_zeros, const matrix_expression<AE> &ae)

The extended copy constructor.

void resize (size_type size1, size_type size2, bool preserve = true)

Reallocates a mapped_matrix to hold at most size1 rows of size2 elements. The existing elements of the mapped_matrix are preseved when specified.

size_type size1 () const

Returns the number of rows.

size_type size2 () const

Returns the number of columns.

const_reference operator () (size_type i, size_type j) const

Returns the value of the j-th element in the i-th row.

reference operator () (size_type i, size_type j)

Returns a reference of the j-th element in the i-th row.

mapped_matrix &operator = (const mapped_matrix &m)

The assignment operator.

mapped_matrix &assign_temporary (mapped_matrix &m)

Assigns a temporary. May change the mapped matrix m .

template<class AE> mapped_matrix &operator = (const matrix_expression<AE> &ae)

The extended assignment operator.

template<class AE> mapped_matrix &assign (const matrix_expression<AE> &ae)

Assigns a matrix expression to the mapped matrix. Left and right hand side of the assignment should be independent.

template<class AE> mapped_matrix &operator += (const matrix_expression<AE> &ae)

A computed assignment operator. Adds the matrix expression to the mapped matrix.

template<class AE> mapped_matrix &plus_assign (const matrix_expression<AE> &ae)

Adds a matrix expression to the mapped matrix. Left and right hand side of the assignment should be independent.

template<class AE> mapped_matrix &operator -= (const matrix_expression<AE> &ae)

A computed assignment operator. Subtracts the matrix expression from the mapped matrix.

template<class AE> mapped_matrix &minus_assign (const matrix_expression<AE> &ae)

Subtracts a matrix expression from the mapped matrix. Left and right hand side of the assignment should be independent.

template<class AT> mapped_matrix &operator *= (const AT &at)

A computed assignment operator. Multiplies the mapped matrix with a scalar.

template<class AT> mapped_matrix &operator /= (const AT &at)

A computed assignment operator. Divides the mapped matrix through a scalar.

void swap (mapped_matrix &m)

Swaps the contents of the mapped matrices.

true_refrence insert_element (size_type i, size_type j, const_reference t)

Inserts the value t at the j-th element of the i-th row. Duplicates elements are not allowed.

void erase_element (size_type i, size_type j)

Erases the value at the j-th element of the i-th row.

void clear ()

Clears the mapped matrix.

const_iterator1 begin1 () const

Returns a const_iterator1 pointing to the beginning of the mapped_matrix.

const_iterator1 end1 () const

Returns a const_iterator1 pointing to the end of the mapped_matrix.

iterator1 begin1 ()

Returns a iterator1 pointing to the beginning of the mapped_matrix.

iterator1 end1 ()

Returns a iterator1 pointing to the end of the mapped_matrix.

const_iterator2 begin2 () const

Returns a const_iterator2 pointing to the beginning of the mapped_matrix.

const_iterator2 end2 () const

Returns a const_iterator2 pointing to the end of the mapped_matrix.

iterator2 begin2 ()

Returns a iterator2 pointing to the beginning of the mapped_matrix.

iterator2 end2 ()

Returns a iterator2 pointing to the end of the mapped_matrix.

const_reverse_iterator1 rbegin1 () const

Returns a const_reverse_iterator1 pointing to the beginning of the reversed mapped_matrix.

const_reverse_iterator1 rend1 () const

Returns a const_reverse_iterator1 pointing to the end of the reversed mapped_matrix.

reverse_iterator1 rbegin1 ()

Returns a reverse_iterator1 pointing to the beginning of the reversed mapped_matrix.

reverse_iterator1 rend1 ()

Returns a reverse_iterator1 pointing to the end of the reversed mapped_matrix.

const_reverse_iterator2 rbegin2 () const

Returns a const_reverse_iterator2 pointing to the beginning of the reversed mapped_matrix.

const_reverse_iterator2 rend2 () const

Returns a const_reverse_iterator2 pointing to the end of the reversed mapped_matrix.

reverse_iterator2 rbegin2 ()

Returns a reverse_iterator2 pointing to the beginning of the reversed mapped_matrix.

reverse_iterator2 rend2 ()

Returns a reverse_iterator2 pointing to the end of the reversed mapped_matrix.

Notes

[1] Supported parameters for the storage organization are row_major and column_major.

[2] Supported parameters for the adapted array are map_array<std::size_t, T> and map_std<std::size_t, T>. The latter is equivalent to std::map<std::size_t, T>.

Compressed Matrix

Description

The templated class compressed_matrix<T, F, IB, IA, TA> is the base container adaptor for compressed matrices. For a (m x n )-dimensional compressed matrix and 0 < = i < m, 0 < = j < n the non-zero elements mi,j are mapped via (i x n + j) for row major orientation or via (i + j x m) for column major orientation to consecutive elements of the index and value containers, i.e. for elements k = mi1,j1and k + 1 = mi2,j2 of the container holds i1 < i2 or (i1 = i2 and j1 < j2) with row major orientation or j1 < j2 or (j1 = j2 and i1 < i__2) with column major orientation.

Example

#include <boost/numeric/ublas/matrix_sparse.hpp>
#include <boost/numeric/ublas/io.hpp>

int main () {
    using namespace boost::numeric::ublas;
    compressed_matrix<double> m (3, 3, 3 * 3);
    for (unsigned i = 0; i < m.size1 (); ++ i)
        for (unsigned j = 0; j < m.size2 (); ++ j)
            m (i, j) = 3 * i + j;
    std::cout << m << std::endl;
}

Definition

Defined in the header matrix_sparse.hpp.

Template parameters

Parameter Description Default

T

The type of object stored in the compressed matrix.

F

Functor describing the storage organization. [1]

row_major

IB

The index base of the compressed vector. [2]

0

IA

The type of the adapted array for indices. [3]

unbounded_array<std::size_t>

TA

The type of the adapted array for values. [3]

unbounded_array<T>

Model of

Matrix .

Type requirements

None, except for those imposed by the requirements of Matrix .

Public base classes

matrix_container<compressed_matrix<T, F, IB, IA, TA> >

Members

Member Description

compressed_matrix ()

Allocates a compressed_matrix that holds at most zero rows of zero elements.

compressed_matrix (size_type size1, size_type2, size_type non_zeros = 0)

Allocates a compressed_matrix that holds at most size1 rows of size2 elements.

compressed_matrix (const compressed_matrix &m)

The copy constructor.

template<class AE> compressed_matrix (size_type non_zeros, const matrix_expression<AE> &ae)

The extended copy constructor.

void resize (size_type size1, size_type size2, bool preserve = true)

Reallocates a compressed_matrix to hold at most size1 rows of size2 elements. The existing elements of the compressed_matrix are preseved when specified.

size_type size1 () const

Returns the number of rows.

size_type size2 () const

Returns the number of columns.

const_reference operator () (size_type i, size_type j) const

Returns the value of the j-th element in the i-th row.

reference operator () (size_type i, size_type j)

Returns a reference of the j-th element in the i-th row.

compressed_matrix &operator = (const compressed_matrix &m)

The assignment operator.

compressed_matrix &assign_temporary (compressed_matrix &m)

Assigns a temporary. May change the compressed matrix m.

template<class AE> compressed_matrix &operator = (const matrix_expression<AE> &ae)

The extended assignment operator.

template<class AE> compressed_matrix &assign (const matrix_expression<AE> &ae)

Assigns a matrix expression to the compressed matrix. Left and right hand side of the assignment should be independent.

template<class AE> compressed_matrix &operator += (const matrix_expression<AE> &ae)

A computed assignment operator. Adds the matrix expression to the compressed matrix.

template<class AE> compressed_matrix &plus_assign (const matrix_expression<AE> &ae)

Adds a matrix expression to the compressed matrix. Left and right hand side of the assignment should be independent.

template<class AE> compressed_matrix &operator -= (const matrix_expression<AE> &ae)

A computed assignment operator. Subtracts the matrix expression from the compressed matrix.

template<class AE> compressed_matrix &minus_assign (const matrix_expression<AE> &ae)

Subtracts a matrix expression from the compressed matrix. Left and right hand side of the assignment should be independent.

template<class AT> compressed_matrix &operator *= (const AT &at)

A computed assignment operator. Multiplies the compressed matrix with a scalar.

template<class AT> compressed_matrix &operator /= (const AT &at)

A computed assignment operator. Divides the compressed matrix through a scalar.

void swap (compressed_matrix &m)

Swaps the contents of the compressed matrices.

true_reference insert_element (size_type i, size_type j, const_reference t)

Inserts the value t at the j-th element of the i-th row. Duplicates elements are not allowed.

void erase_element (size_type i, size_type j)

Erases the value at the j-th element of the i-th row.

void clear ()

Clears the compressed matrix.

const_iterator1 begin1 () const

Returns a const_iterator1 pointing to the beginning of the compressed_matrix.

const_iterator1 end1 () const

Returns a const_iterator1 pointing to the end of the compressed_matrix.

iterator1 begin1 ()

Returns a iterator1 pointing to the beginning of the compressed_matrix.

iterator1 end1 ()

Returns a iterator1 pointing to the end of the compressed_matrix.

const_iterator2 begin2 () const

Returns a const_iterator2 pointing to the beginning of the compressed_matrix.

const_iterator2 end2 () const

Returns a const_iterator2 pointing to the end of the compressed_matrix.

iterator2 begin2 ()

Returns a iterator2 pointing to the beginning of the compressed_matrix.

iterator2 end2 ()

Returns a iterator2 pointing to the end of the compressed_matrix.

const_reverse_iterator1 rbegin1 () const

Returns a const_reverse_iterator1 pointing to the beginning of the reversed compressed_matrix.

const_reverse_iterator1 rend1 () const

Returns a const_reverse_iterator1 pointing to the end of the reversed compressed_matrix.

reverse_iterator1 rbegin1 ()

Returns a reverse_iterator1 pointing to the beginning of the reversed compressed_matrix.

reverse_iterator1 rend1 ()

Returns a reverse_iterator1 pointing to the end of the reversed compressed_matrix.

const_reverse_iterator2 rbegin2 () const

Returns a const_reverse_iterator2 pointing to the beginning of the reversed compressed_matrix.

const_reverse_iterator2 rend2 () const

Returns a const_reverse_iterator2 pointing to the end of the reversed compressed_matrix.

reverse_iterator2 rbegin2 ()

Returns a reverse_iterator2 pointing to the beginning of the reversed compressed_matrix.

reverse_iterator2 rend2 ()

Returns a reverse_iterator2 pointing to the end of the reversed compressed_matrix.

Notes

[1] Supported parameters for the storage organization are row_major and column_major.

[2] Supported parameters for the index base are 0 and 1 at least.

[3] Supported parameters for the adapted array are unbounded_array<> , bounded_array<> and std::vector<> .

Coordinate Matrix

Description

The templated class coordinate_matrix<T, F, IB, IA, TA> is the base container adaptor for compressed matrices. For a (m x n )-dimensional sorted coordinate matrix and 0 < = i < m, 0 < = j < n the non-zero elements mi,j are mapped via (i x n + j) for row major orientation or via (i + j x m) for column major orientation to consecutive elements of the index and value containers, i.e. for elements k = mi1,j1 and k + 1 = mi2,j2 of the container holds i1 < i2 or (i1 = i2 and j1 < j2) with row major orientation or j1 < j2 or (j1 = j2 and i1 < i__2) with column major orientation.

Example

#include <boost/numeric/ublas/matrix_sparse.hpp>
#include <boost/numeric/ublas/io.hpp>

int main () {
    using namespace boost::numeric::ublas;
    coordinate_matrix<double> m (3, 3, 3 * 3);
    for (unsigned i = 0; i < m.size1 (); ++ i)
        for (unsigned j = 0; j < m.size2 (); ++ j)
            m (i, j) = 3 * i + j;
    std::cout << m << std::endl;
}

Definition

Defined in the header matrix_sparse.hpp.

Template parameters

Parameter Description Default

T

The type of object stored in the coordinate matrix.

F

Functor describing the storage organization. [1]

row_major

IB

The index base of the coordinate vector. [2]

0

IA

The type of the adapted array for indices. [3]

unbounded_array<std::size_t>

TA

The type of the adapted array for values. [3]

unbounded_array<T>

Model of

Matrix .

Type requirements

None, except for those imposed by the requirements of Matrix .

Public base classes

matrix_container<coordinate_matrix<T, F, IB, IA, TA> >

Members

Member Description

coordinate_matrix ()

Allocates a coordinate_matrix that holds at most zero rows of zero elements.

coordinate_matrix (size_type size1, size_type2, size_type non_zeros = 0)

Allocates a coordinate_matrix that holds at most size1 rows of size2 elements.

coordinate_matrix (const coordinate_matrix &m)

The copy constructor.

template<class AE> coordinate_matrix (size_type non_zeros, const matrix_expression<AE> &ae)

The extended copy constructor.

void resize (size_type size1, size_type size2, bool preserve = true)

Reallocates a coordinate_matrix to hold at most size1 rows of size2 elements. The existing elements of the coordinate_matrix are preseved when specified.

size_type size1 () const

Returns the number of rows.

size_type size2 () const

Returns the number of columns.

const_reference operator () (size_type i, size_type j) const

Returns the value of the j-th element in the i-th row.

reference operator () (size_type i, size_type j)

Returns a reference of the j-th element in the i-th row.

coordinate_matrix &operator = (const coordinate_matrix &m)

The assignment operator.

coordinate_matrix &assign_temporary (coordinate_matrix &m)

Assigns a temporary. May change the coordinate matrix m.

template<class AE> coordinate_matrix &operator = (const matrix_expression<AE> &ae)

The extended assignment operator.

template<class AE> coordinate_matrix &assign (const matrix_expression<AE> &ae)

Assigns a matrix expression to the coordinate matrix. Left and right hand side of the assignment should be independent.

template<class AE> coordinate_matrix &operator += (const matrix_expression<AE> &ae)

A computed assignment operator. Adds the matrix expression to the coordinate matrix.

template<class AE> coordinate_matrix &plus_assign (const matrix_expression<AE> &ae)

Adds a matrix expression to the coordinate matrix. Left and right hand side of the assignment should be independent.

template<class AE> coordinate_matrix &operator -= (const matrix_expression<AE> &ae)

A computed assignment operator. Subtracts the matrix expression from the coordinate matrix.

template<class AE> coordinate_matrix &minus_assign (const matrix_expression<AE> &ae)

Subtracts a matrix expression from the coordinate matrix. Left and right hand side of the assignment should be independent.

template<class AT> coordinate_matrix &operator *= (const AT &at)

A computed assignment operator. Multiplies the coordinate matrix with a scalar.

template<class AT> coordinate_matrix &operator /= (const AT &at)

A computed assignment operator. Divides the coordinate matrix through a scalar.

void swap (coordinate_matrix &m)

Swaps the contents of the coordinate matrices.

true_reference insert_element (size_type i, size_type j, const_reference t)

Inserts the value t at the j-th element of the i-th row. Duplicates elements are not allowed.

void append_element (size_type i, size_type j, const_reference t)

Appends the value t at the j-th element of the i-th row. Duplicate elements can be appended to a coordinate_matrix. They are merged into a single arithmetically summed element by the sort function.

void erase_element (size_type i, size_type j)

Erases the value at the j-th element of the i-th row.

void clear ()

Clears the coordinate matrix.

const_iterator1 begin1 () const

Returns a const_iterator1 pointing to the beginning of the coordinate_matrix.

const_iterator1 end1 () const

Returns a const_iterator1 pointing to the end of the coordinate_matrix.

iterator1 begin1 ()

Returns a iterator1 pointing to the beginning of the coordinate_matrix.

iterator1 end1 ()

Returns a iterator1 pointing to the end of the coordinate_matrix.

const_iterator2 begin2 () const

Returns a const_iterator2 pointing to the beginning of the coordinate_matrix.

const_iterator2 end2 () const

Returns a const_iterator2 pointing to the end of the coordinate_matrix.

iterator2 begin2 ()

Returns a iterator2 pointing to the beginning of the coordinate_matrix.

iterator2 end2 ()

Returns a iterator2 pointing to the end of the coordinate_matrix.

const_reverse_iterator1 rbegin1 () const

Returns a const_reverse_iterator1 pointing to the beginning of the reversed coordinate_matrix.

const_reverse_iterator1 rend1 () const

Returns a const_reverse_iterator1 pointing to the end of the reversed coordinate_matrix.

reverse_iterator1 rbegin1 ()

Returns a reverse_iterator1 pointing to the beginning of the reversed coordinate_matrix.

reverse_iterator1 rend1 ()

Returns a reverse_iterator1 pointing to the end of the reversed coordinate_matrix.

const_reverse_iterator2 rbegin2 () const

Returns a const_reverse_iterator2 pointing to the beginning of the reversed coordinate_matrix.

const_reverse_iterator2 rend2 () const

Returns a const_reverse_iterator2 pointing to the end of the reversed coordinate_matrix.

reverse_iterator2 rbegin2 ()

Returns a reverse_iterator2 pointing to the beginning of the reversed coordinate_matrix.

reverse_iterator2 rend2 ()

Returns a reverse_iterator2 pointing to the end of the reversed coordinate_matrix.

Notes

[1] Supported parameters for the storage organization are row_major and column_major.

[2] Supported parameters for the index base are 0 and 1 at least.

[3] Supported parameters for the adapted array are unbounded_array<> , bounded_array<> and std::vector<> .


Copyright (©) 2000-2002 Joerg Walter, Mathias Koch
Copyright (©) 2021 Shikhar Vashistha
Use, modification and distribution are subject to the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt ).