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Matrix Proxies

Matrix Row

Description

The templated class matrix_row<M> allows addressing a row of a matrix.

Example

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

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

Definition

Defined in the header matrix_proxy.hpp.

Template parameters

Parameter Description Default
M The type of matrix referenced.

Model of

Vector Expression .

If the specified row falls outside that of the row index range of the matrix, then the matrix_row is not a well formed Vector Expression. That is, access to an element which is outside of the matrix is undefined.

Type requirements

None, except for those imposed by the requirements of Vector Expression .

Public base classes

vector_expression<matrix_row<M> >

Members

Member Description
matrix_row (matrix_type &data, size_type i) Constructs a sub vector.
size_type size () const Returns the size of the sub vector.
const_reference operator () (size_type i) const Returns the value of the i-th element.
reference operator () (size_type i) Returns a reference of the i-th element.
matrix_row &operator = (const matrix_row &mr) The assignment operator.
matrix_row &assign_temporary (matrix_row &mr) Assigns a temporary. May change the matrix row mr .
template<class AE>
matrix_row &operator = (const vector_expression<AE> &ae)
The extended assignment operator.
template<class AE>
matrix_row &assign (const vector_expression<AE> &ae)
Assigns a vector expression to the sub vector. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_row &operator += (const vector_expression<AE> &ae)
A computed assignment operator. Adds the vector expression to the sub vector.
template<class AE>
matrix_row &plus_assign (const vector_expression<AE> &ae)
Adds a vector expression to the sub vector. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_row &operator -= (const vector_expression<AE> &ae)
A computed assignment operator. Subtracts the vector expression from the sub vector.
template<class AE>
matrix_row &minus_assign (const vector_expression<AE> &ae)
Subtracts a vector expression from the sub vector. Left and right hand side of the assignment should be independent.
template<class AT>
matrix_row &operator *= (const AT &at)
A computed assignment operator. Multiplies the sub vector with a scalar.
template<class AT>
matrix_row &operator /= (const AT &at)
A computed assignment operator. Divides the sub vector through a scalar.
void swap (matrix_row &mr) Swaps the contents of the sub vectors.
const_iterator begin () const Returns a const_iterator pointing to the beginning of the matrix_row.
const_iterator end () const Returns a const_iterator pointing to the end of the matrix_row.
iterator begin () Returns a iterator pointing to the beginning of the matrix_row.
iterator end () Returns a iterator pointing to the end of the matrix_row.
const_reverse_iterator rbegin () const Returns a const_reverse_iterator pointing to the beginning of the reversed matrix_row.
const_reverse_iterator rend () const Returns a const_reverse_iterator pointing to the end of the reversed matrix_row.
reverse_iterator rbegin () Returns a reverse_iterator pointing to the beginning of the reversed matrix_row.
reverse_iterator rend () Returns a reverse_iterator pointing to the end of the reversed matrix_row.

Projections

Description

The free row functions support the construction of matrix rows.

Prototypes


    template<class M>
    matrix_row<M> row (M &data, std::size_t i);
    template<class M>
    const matrix_row<const M> row (const M &data, std::size_t i);

Definition

Defined in the header matrix_proxy.hpp.

Type requirements

Complexity

Linear depending from the size of the row.

Examples

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

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

Matrix Column

Description

The templated class matrix_column<M> allows addressing a column of a matrix.

Example

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

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

Definition

Defined in the header matrix_proxy.hpp.

Template parameters

Parameter Description Default
M The type of matrix referenced.

Model of

Vector Expression .

If the specified column falls outside that of the column index range of the matrix, then the matrix_column is not a well formed Vector Expression. That is, access to an element which is outside of the matrix is undefined.

Type requirements

None, except for those imposed by the requirements of Vector Expression .

Public base classes

vector_expression<matrix_column<M> >

Members

Member Description
matrix_column (matrix_type &data, size_type j) Constructs a sub vector.
size_type size () const Returns the size of the sub vector.
const_reference operator () (size_type i) const Returns the value of the i-th element.
reference operator () (size_type i) Returns a reference of the i-th element.
matrix_column &operator = (const matrix_column &mc) The assignment operator.
matrix_column &assign_temporary (matrix_column &mc) Assigns a temporary. May change the matrix column mc .
template<class AE>
matrix_column &operator = (const vector_expression<AE> &ae)
The extended assignment operator.
template<class AE>
matrix_column &assign (const vector_expression<AE> &ae)
Assigns a vector expression to the sub vector. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_column &operator += (const vector_expression<AE> &ae)
A computed assignment operator. Adds the vector expression to the sub vector.
template<class AE>
matrix_column &plus_assign (const vector_expression<AE> &ae)
Adds a vector expression to the sub vector. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_column &operator -= (const vector_expression<AE> &ae)
A computed assignment operator. Subtracts the vector expression from the sub vector.
template<class AE>
matrix_column &minus_assign (const vector_expression<AE> &ae)
Subtracts a vector expression from the sub vector. Left and right hand side of the assignment should be independent.
template<class AT>
matrix_column &operator *= (const AT &at)
A computed assignment operator. Multiplies the sub vector with a scalar.
template<class AT>
matrix_column &operator /= (const AT &at)
A computed assignment operator. Divides the sub vector through a scalar.
void swap (matrix_column &mc) Swaps the contents of the sub vectors.
const_iterator begin () const Returns a const_iterator pointing to the beginning of the matrix_column.
const_iterator end () const Returns a const_iterator pointing to the end of the matrix_column.
iterator begin () Returns a iterator pointing to the beginning of the matrix_column.
iterator end () Returns a iterator pointing to the end of the matrix_column.
const_reverse_iterator rbegin () const Returns a const_reverse_iterator pointing to the beginning of the reversed matrix_column.
const_reverse_iterator rend () const Returns a const_reverse_iterator pointing to the end of the reversed matrix_column.
reverse_iterator rbegin () Returns a reverse_iterator pointing to the beginning of the reversed matrix_column.
reverse_iterator rend () Returns a reverse_iterator pointing to the end of the reversed matrix_column.

Projections

Description

The free column functions support the construction of matrix columns.

Prototypes


    template<class M>
    matrix_column<M> column (M &data, std::size_t j);
    template<class M>
    const matrix_column<const M> column (const M &data, std::size_t j);

Definition

Defined in the header matrix_proxy.hpp.

Type requirements

Complexity

Linear depending from the size of the column.

Examples

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

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

Vector Range

Description

The templated class matrix_vector_range<M> allows addressing a sub vector of a matrix.

Example

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

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

    matrix_vector_range<matrix<double> > mvr (m, range (0, 3), range (0, 3));
    std::cout << mvr << std::endl;
}

Definition

Defined in the header matrix_proxy.hpp.

Template parameters

Parameter Description Default
M The type of matrix referenced.

Model of

Vector Expression .

If the specified ranges fall outside that of the index range of the matrix, then the matrix_vector_range is not a well formed Vector Expression. That is, access to an element which is outside of the matrix is undefined.

Type requirements

None, except for those imposed by the requirements of Vector Expression .

Public base classes

vector_expression<matrix_vector_range<M> >

Members

Member Description
matrix_vector_range (matrix_type &data,
const range &r1, const range &r2)
Constructs a sub vector.
size_type size () const Returns the size of the sub vector.
const_reference operator () (size_type i) const Returns the value of the i-th element.
reference operator () (size_type i) Returns a reference of the i-th element.
matrix_vector_range &operator = (const matrix_vector_range &mvr) The assignment operator.
matrix_vector_range &assign_temporary (matrix_vector_range &mvr) Assigns a temporary. May change the matrix vector range mvr.
template<class AE>
matrix_vector_range &operator = (const vector_expression<AE> &ae)
The extended assignment operator.
template<class AE>
matrix_vector_range &assign (const vector_expression<AE> &ae)
Assigns a vector expression to the sub vector. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_vector_range &operator += (const vector_expression<AE> &ae)
A computed assignment operator. Adds the vector expression to the sub vector.
template<class AE>
matrix_vector_range &plus_assign (const vector_expression<AE> &ae)
Adds a vector expression to the sub vector. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_vector_range &operator -= (const vector_expression<AE> &ae)
A computed assignment operator. Subtracts the vector expression from the sub vector.
template<class AE>
matrix_vector_range &minus_assign (const vector_expression<AE> &ae)
Subtracts a vector expression from the sub vector. Left and right hand side of the assignment should be independent.
template<class AT>
matrix_vector_range &operator *= (const AT &at)
A computed assignment operator. Multiplies the sub vector with a scalar.
template<class AT>
matrix_vector_range &operator /= (const AT &at)
A computed assignment operator. Divides the sub vector through a scalar.
void swap (matrix_vector_range &mvr) Swaps the contents of the sub vectors.
const_iterator begin () const Returns a const_iterator pointing to the beginning of the matrix_vector_range.
const_iterator end () const Returns a const_iterator pointing to the end of the matrix_vector_range.
iterator begin () Returns a iterator pointing to the beginning of the matrix_vector_range.
iterator end () Returns a iterator pointing to the end of the matrix_vector_range.
const_reverse_iterator rbegin () const Returns a const_reverse_iterator pointing to the beginning of the matrix_vector_range.
const_reverse_iterator rend () const Returns a const_reverse_iterator pointing to the end of the reversed matrix_vector_range.
reverse_iterator rbegin () Returns a reverse_iterator pointing to the beginning of the reversed matrix_vector_range.
reverse_iterator rend () Returns a reverse_iterator pointing to the end of the reversed matrix_vector_range.

Vector Slice

Description

The templated class matrix_vector_slice<M> allows addressing a sliced sub vector of a matrix.

Example

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

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

    matrix_vector_slice<matrix<double> > mvs (m, slice (0, 1, 3), slice (0, 1, 3));
    std::cout << mvs << std::endl;
}

Definition

Defined in the header matrix_proxy.hpp.

Template parameters

Parameter Description Default
M The type of matrix referenced.

Model of

Vector Expression .

If the specified slices fall outside that of the index range of the matrix, then the matrix_vector_slice is not a well formed Vector Expression. That is, access to an element which is outside of the matrix is undefined.

Type requirements

None, except for those imposed by the requirements of Vector Expression .

Public base classes

vector_expression<matrix_vector_slice<M> >

Members

Member Description
matrix_vector_slice (matrix_type &data,
const slice &s1, const slice &s2)
Constructs a sub vector.
size_type size () const Returns the size of the sub vector.
const_reference operator () (size_type i) const Returns the value of the i-th element.
reference operator () (size_type i) Returns a reference of the i-th element.
matrix_vector_slice &operator = (const matrix_vector_slice &mvs) The assignment operator.
matrix_vector_slice &assign_temporary (matrix_vector_slice &mvs) Assigns a temporary. May change the matrix vector slice vs.
template<class AE>
matrix_vector_slice &operator = (const vector_expression<AE> &ae)
The extended assignment operator.
template<class AE>
matrix_vector_slice &assign (const vector_expression<AE> &ae)
Assigns a vector expression to the sub vector. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_vector_slice &operator += (const vector_expression<AE> &ae)
A computed assignment operator. Adds the vector expression to the sub vector.
template<class AE>
matrix_vector_slice &plus_assign (const vector_expression<AE> &ae)
Adds a vector expression to the sub vector. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_vector_slice &operator -= (const vector_expression<AE> &ae)
A computed assignment operator. Subtracts the vector expression from the sub vector.
template<class AE>
matrix_vector_slice &minus_assign (const vector_expression<AE> &ae)
Subtracts a vector expression from the sub vector. Left and right hand side of the assignment should be independent.
template<class AT>
matrix_vector_slice &operator *= (const AT &at)
A computed assignment operator. Multiplies the sub vector with a scalar.
template<class AT>
matrix_vector_slice &operator /= (const AT &at)
A computed assignment operator. Divides the sub vector through a scalar.
void swap (matrix_vector_slice &mvs) Swaps the contents of the sub vectors.
const_iterator begin () const Returns a const_iterator pointing to the beginning of the matrix_vector_slice.
const_iterator end () const Returns a const_iterator pointing to the end of the matrix_vector_slice.
iterator begin () Returns a iterator pointing to the beginning of the matrix_vector_slice.
iterator end () Returns a iterator pointing to the end of the matrix_vector_slice.
const_reverse_iterator rbegin () const Returns a const_reverse_iterator pointing to the beginning of the reversed matrix_vector_slice.
const_reverse_iterator rend () const Returns a const_reverse_iterator pointing to the end of the reversed matrix_vector_slice.
reverse_iterator rbegin () Returns a reverse_iterator pointing to the beginning of the reversed matrix_vector_slice.
reverse_iterator rend () Returns a reverse_iterator pointing to the end of the reversed matrix_vector_slice.

Matrix Range

Description

The templated class matrix_range<M> allows addressing a sub matrix of a matrix.

Example

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

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

Definition

Defined in the header matrix_proxy.hpp.

Template parameters

Parameter Description Default
M The type of matrix referenced.

Model of

Matrix Expression .

If the specified ranges fall outside that of the index range of the matrix, then the matrix_range is not a well formed Matrix Expression. That is, access to an element which is outside of the matrix is undefined.

Type requirements

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

Public base classes

matrix_expression<matrix_range<M> >

Members

Member Description
matrix_range (matrix_type &data,
const range &r1, const range &r2)
Constructs a sub matrix.
size_type start1 () const Returns the index of the first row.
size_type size1 () const Returns the number of rows.
size_type start2 () const Returns the index of the first column.
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.
matrix_range &operator = (const matrix_range &mr) The assignment operator.
matrix_range &assign_temporary (matrix_range &mr) Assigns a temporary. May change the matrix range mr .
template<class AE>
matrix_range &operator = (const matrix_expression<AE> &ae)
The extended assignment operator.
template<class AE>
matrix_range &assign (const matrix_expression<AE> &ae)
Assigns a matrix expression to the sub matrix. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_range &operator += (const matrix_expression<AE> &ae)
A computed assignment operator. Adds the matrix expression to the sub matrix.
template<class AE>
matrix_range &plus_assign (const matrix_expression<AE> &ae)
Adds a matrix expression to the sub matrix. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_range &operator -= (const matrix_expression<AE> &ae)
A computed assignment operator. Subtracts the matrix expression from the sub matrix.
template<class AE>
matrix_range &minus_assign (const matrix_expression<AE> &ae)
Subtracts a matrix expression from the sub matrix. Left and right hand side of the assignment should be independent.
template<class AT>
matrix_range &operator *= (const AT &at)
A computed assignment operator. Multiplies the sub matrix with a scalar.
template<class AT>
matrix_range &operator /= (const AT &at)
A computed assignment operator. Divides the sub matrix through a scalar.
void swap (matrix_range &mr) Swaps the contents of the sub matrices.
const_iterator1 begin1 () const Returns a const_iterator1 pointing to the beginning of the matrix_range.
const_iterator1 end1 () const Returns a const_iterator1 pointing to the end of the matrix_range.
iterator1 begin1 () Returns a iterator1 pointing to the beginning of the matrix_range.
iterator1 end1 () Returns a iterator1 pointing to the end of the matrix_range.
const_iterator2 begin2 () const Returns a const_iterator2 pointing to the beginning of the matrix_range.
const_iterator2 end2 () const Returns a const_iterator2 pointing to the end of the matrix_range.
iterator2 begin2 () Returns a iterator2 pointing to the beginning of the matrix_range.
iterator2 end2 () Returns a iterator2 pointing to the end of the matrix_range.
const_reverse_iterator1 rbegin1 () const Returns a const_reverse_iterator1 pointing to the beginning of the reversed matrix_range.
const_reverse_iterator1 rend1 () const Returns a const_reverse_iterator1 pointing to the end of the reversed matrix_range.
reverse_iterator1 rbegin1 () Returns a reverse_iterator1 pointing to the beginning of the reversed matrix_range.
reverse_iterator1 rend1 () Returns a reverse_iterator1 pointing to the end of the reversed matrix_range.
const_reverse_iterator2 rbegin2 () const Returns a const_reverse_iterator2 pointing to the beginning of the reversed matrix_range.
const_reverse_iterator2 rend2 () const Returns a const_reverse_iterator2 pointing to the end of the reversed matrix_range.
reverse_iterator2 rbegin2 () Returns a reverse_iterator2 pointing to the beginning of the reversed matrix_range.
reverse_iterator2 rend2 () Returns a reverse_iterator2 pointing to the end of reversed the matrix_range.

Simple Projections

Description

The free subrange functions support the construction of matrix ranges.

Prototypes


    template<class M>
    matrix_range<M> subrange (M &data,
       M::size_type start1, M::size_type stop1, M::size_type start2, M::size_type, stop2);
    template<class M>
    const matrix_range<const M> subrange (const M &data,
       M::size_type start1, M::size_type stop1, M::size_type start2, M::size_type, stop2);

Generic Projections

Description

The free project functions support the construction of matrix ranges. Existing matrix_range's can be composed with further ranges. The resulting ranges are computed using this existing ranges' compose function.

Prototypes


    template<class M>
    matrix_range<M> project (M &data, const range &r1, const range &r2);
    template<class M>
    const matrix_range<const M> project (const M &data, const range &r1, const range &r2);
    template<class M>
    matrix_range<M> project (matrix_range<M> &data, const range &r1, const range &r2);
    template<class M>
    const matrix_range<M> project (const matrix_range<M> &data, const range &r1, const range &r2);

Definition

Defined in the header matrix_proxy.hpp.

Type requirements

Complexity

Quadratic depending from the size of the ranges.

Examples

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

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

Matrix Slice

Description

The templated class matrix_slice<M> allows addressing a sliced sub matrix of a matrix.

Example

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

int main () {
    using namespace boost::numeric::ublas;
    matrix<double> m (3, 3);
    matrix_slice<matrix<double> > ms (m, slice (0, 1, 3), slice (0, 1, 3));
    for (unsigned i = 0; i < ms.size1 (); ++ i)
        for (unsigned j = 0; j < ms.size2 (); ++ j)
            ms (i, j) = 3 * i + j;
    std::cout << ms << std::endl;
}

Definition

Defined in the header matrix_proxy.hpp.

Template parameters

Parameter Description Default
M The type of matrix referenced.

Model of

Matrix Expression .

If the specified slices fall outside that of the index range of the matrix, then the matrix_slice is not a well formed Matrix Expression. That is, access to an element which is outside of the matrix is undefined.

Type requirements

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

Public base classes

matrix_expression<matrix_slice<M> >

Members

Member Description
matrix_slice (matrix_type &data,
const slice &s1, const slice &s2)
Constructs a sub matrix.
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.
matrix_slice &operator = (const matrix_slice &ms) The assignment operator.
matrix_slice &assign_temporary (matrix_slice &ms) Assigns a temporary. May change the matrix slice ms .
template<class AE>
matrix_slice &operator = (const matrix_expression<AE> &ae)
The extended assignment operator.
template<class AE>
matrix_slice &assign (const matrix_expression<AE> &ae)
Assigns a matrix expression to the sub matrix. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_slice &operator += (const matrix_expression<AE> &ae)
A computed assignment operator. Adds the matrix expression to the sub matrix.
template<class AE>
matrix_slice &plus_assign (const matrix_expression<AE> &ae)
Adds a matrix expression to the sub matrix. Left and right hand side of the assignment should be independent.
template<class AE>
matrix_slice &operator -= (const matrix_expression<AE> &ae)
A computed assignment operator. Subtracts the matrix expression from the sub matrix.
template<class AE>
matrix_slice &minus_assign (const matrix_expression<AE> &ae)
Subtracts a matrix expression from the sub matrix. Left and right hand side of the assignment should be independent.
template<class AT>
matrix_slice &operator *= (const AT &at)
A computed assignment operator. Multiplies the sub matrix with a scalar.
template<class AT>
matrix_slice &operator /= (const AT &at)
A computed assignment operator. Multiplies the sub matrix through a scalar.
void swap (matrix_slice &ms) Swaps the contents of the sub matrices.
const_iterator1 begin1 () const Returns a const_iterator1 pointing to the beginning of the matrix_slice.
const_iterator1 end1 () const Returns a const_iterator1 pointing to the end of the matrix_slice.
iterator1 begin1 () Returns a iterator1 pointing to the beginning of the matrix_slice.
iterator1 end1 () Returns a iterator1 pointing to the end of the matrix_slice.
const_iterator2 begin2 () const Returns a const_iterator2 pointing to the beginning of the matrix_slice.
const_iterator2 end2 () const Returns a const_iterator2 pointing to the end of the matrix_slice.
iterator2 begin2 () Returns a iterator2 pointing to the beginning of the matrix_slice.
iterator2 end2 () Returns a iterator2 pointing to the end of the matrix_slice.
const_reverse_iterator1 rbegin1 () const Returns a const_reverse_iterator1 pointing to the beginning of the reversed matrix_slice.
const_reverse_iterator1 rend1 () const Returns a const_reverse_iterator1 pointing to the end of the reversed matrix_slice.
reverse_iterator1 rbegin1 () Returns a reverse_iterator1 pointing to the beginning of the reversed matrix_slice.
reverse_iterator1 rend1 () Returns a reverse_iterator1 pointing to the end of the reversed matrix_slice.
const_reverse_iterator2 rbegin2 () const Returns a const_reverse_iterator2 pointing to the beginning of the reversed matrix_slice.
const_reverse_iterator2 rend2 () const Returns a const_reverse_iterator2 pointing to the end of the reversed matrix_slice.
reverse_iterator2 rbegin2 () Returns a reverse_iterator2 pointing to the beginning of the reversed matrix_slice.
reverse_iterator2 rend2 () Returns a reverse_iterator2 pointing to the end of the reversed matrix_slice.

Simple Projections

Description

The free subslice functions support the construction of matrix slices.

Prototypes


    template<class M>
    matrix_slice<M> subslice (M &data,
       M::size_type start1, M::difference_type stride1, M::size_type size1,
       M::size_type start2, M::difference_type stride2, M::size_type size2);
    template<class M>
    const matrix_slice<const M> subslice (const M &data,
       M::size_type start1, M::difference_type stride1, M::size_type size1,
       M::size_type start2, M::difference_type stride2, M::size_type size2);

Generic Projections

Description

The free project functions support the construction of matrix slices. Existing matrix_slice's can be composed with further ranges or slices. The resulting slices are computed using this existing slices' compose function.

Prototypes


    template<class M>
    matrix_slice<M> project (M &data, const slice &s1, const slice &s2);
    template<class M>
    const matrix_slice<const M> project (const M &data, const slice &s1, const slice &s2);
    template<class M>
    matrix_slice<M> project (matrix_slice<M> &data, const range &r1, const range &r2);
    template<class M>
    const matrix_slice<M> project (const matrix_slice<M> &data, const range &r1, const range &r2);
    template<class M>
    matrix_slice<M> project (matrix_slice<M> &data, const slice &s1, const slice &s2);
    template<class M>
    const matrix_slice<M> project (const matrix_slice<M> &data, const slice &s1, const slice &s2);

Definition

Defined in the header matrix_proxy.hpp.

Type requirements

Complexity

Quadratic depending from the size of the slices.

Examples

#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/matrix_proxy.hpp>
#include <boost/numeric/ublas/io.hpp>

int main () {
    using namespace boost::numeric::ublas;
    matrix<double> m (3, 3);
    for (unsigned i = 0; i < m.size1 (); ++ i)
        for (unsigned j = 0; j < m.size2 (); ++ j)
            project (m, slice (0, 1, 3), slice (0, 1, 3)) (i, j) = 3 * i + j;
    std::cout << project (m, slice (0, 1, 3), slice (0, 1, 3)) << std::endl;
}

Copyright (©) 2000-2002 Joerg Walter, Mathias Koch
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 ).