- Qt 6.9
- Qt GUI
- C++ Classes
- QGenericMatrix
- Qt 6.9.2 Reference Documentation

# QGenericMatrix Class

template <int N, int M, typename T> class QGenericMatrix

The QGenericMatrix class is a template class that represents a NxM transformation matrix with N columns and M rows. More...

Header: | `#include <QGenericMatrix>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Gui)` `target_link_libraries(mytarget PRIVATE Qt6::Gui)`
qmake: | `QT += gui`

- List of all members, including inherited members
- QGenericMatrix is part of Painting Classes and Rendering in 3D.

## Public Functions

| QGenericMatrix()
| QGenericMatrix(const T *values)
const T * | constData() const
void | copyDataTo(T *values) const
T * | data()
const T * | data() const
void | fill(T value)
bool | isIdentity() const
void | setToIdentity()
QGenericMatrix<M, N, T> | transposed() const
bool | operator!=(const QGenericMatrix<N, M, T> &other) const
T & | operator()(int row, int column)
const T & | operator()(int row, int column) const
QGenericMatrix<N, M, T> & | operator*=(T factor)
QGenericMatrix<N, M, T> & | operator+=(const QGenericMatrix<N, M, T> &other)
QGenericMatrix<N, M, T> & | operator-=(const QGenericMatrix<N, M, T> &other)
QGenericMatrix<N, M, T> & | operator/=(T divisor)
bool | operator==(const QGenericMatrix<N, M, T> &other) const

## Related Non-Members

| QMatrix2x2
| QMatrix2x3
| QMatrix2x4
| QMatrix3x2
| QMatrix3x3
| QMatrix3x4
| QMatrix4x2
| QMatrix4x3
QGenericMatrix<N, M, T> | operator*(T factor, const QGenericMatrix<N, M, T> &matrix)
QGenericMatrix<M1, M2, TT> | operator*(const QGenericMatrix<NN, M2, TT> &m1, const QGenericMatrix<M1, NN, TT> &m2)
QGenericMatrix<N, M, T> | operator*(const QGenericMatrix<N, M, T> &matrix, T factor)
QGenericMatrix<N, M, T> | operator+(const QGenericMatrix<N, M, T> &m1, const QGenericMatrix<N, M, T> &m2)
QGenericMatrix<N, M, T> | operator-(const QGenericMatrix<N, M, T> &m1, const QGenericMatrix<N, M, T> &m2)
QGenericMatrix<N, M, T> | operator-(const QGenericMatrix<N, M, T> &matrix)
QGenericMatrix<N, M, T> | operator/(const QGenericMatrix<N, M, T> &matrix, T divisor)
QDataStream & | operator<<(QDataStream &stream, const QGenericMatrix<N, M, T> &matrix)
QDataStream & | operator>>(QDataStream &stream, QGenericMatrix<N, M, T> &matrix)

## Detailed Description

The QGenericMatrix template has three parameters:

N | Number of columns.
M | Number of rows.
T | Element type that is visible to users of the class.

See also QMatrix4x4.

## Member Function Documentation

### QGenericMatrix::QGenericMatrix()

Constructs a NxM identity matrix.

### `[explicit]` QGenericMatrix::QGenericMatrix(const T *values)

Constructs a matrix from the given N * M floating-point values. The contents of the array values is assumed to be in row-major order.

See also copyDataTo().

### const T *QGenericMatrix::constData() const

Returns a constant pointer to the raw data of this matrix.

See also data().

### void QGenericMatrix::copyDataTo(T *values) const

Retrieves the N * M items in this matrix and copies them to values in row-major order.

### T *QGenericMatrix::data()

Returns a pointer to the raw data of this matrix.

See also constData().

### const T *QGenericMatrix::data() const

Returns a constant pointer to the raw data of this matrix.

See also constData().

### void QGenericMatrix::fill(T value)

Fills all elements of this matrix with value.

### bool QGenericMatrix::isIdentity() const

Returns `true` if this matrix is the identity; false otherwise.

See also setToIdentity().

### void QGenericMatrix::setToIdentity()

Sets this matrix to the identity.

See also isIdentity().

### QGenericMatrix<M, N, T> QGenericMatrix::transposed() const

Returns this matrix, transposed about its diagonal.

### bool QGenericMatrix::operator!=(const QGenericMatrix<N, M, T> &other) const

Returns `true` if this matrix is not identical to other; false otherwise.

### T &QGenericMatrix::operator()(int row, int column)

Returns a reference to the element at position (row, column) in this matrix so that the element can be assigned to.

### const T &QGenericMatrix::operator()(int row, int column) const

Returns a constant reference to the element at position (row, column) in this matrix.

### QGenericMatrix<N, M, T> &QGenericMatrix::operator*=(T factor)

Multiplies all elements of this matrix by factor.

### QGenericMatrix<N, M, T> &QGenericMatrix::operator+=(const QGenericMatrix<N, M, T> &other)

Adds the contents of other to this matrix.

### QGenericMatrix<N, M, T> &QGenericMatrix::operator-=(const QGenericMatrix<N, M, T> &other)

Subtracts the contents of other from this matrix.

### QGenericMatrix<N, M, T> &QGenericMatrix::operator/=(T divisor)

Divides all elements of this matrix by divisor.

### bool QGenericMatrix::operator==(const QGenericMatrix<N, M, T> &other) const

Returns `true` if this matrix is identical to other; false otherwise.

## Related Non-Members

### QMatrix2x2

The QMatrix2x2 type defines a convenient instantiation of the QGenericMatrix template for 2 columns, 2 rows, and float as the element type.

### QMatrix2x3

The QMatrix2x3 type defines a convenient instantiation of the QGenericMatrix template for 2 columns, 3 rows, and float as the element type.

### QMatrix2x4

The QMatrix2x4 type defines a convenient instantiation of the QGenericMatrix template for 2 columns, 4 rows, and float as the element type.

### QMatrix3x2

The QMatrix3x2 type defines a convenient instantiation of the QGenericMatrix template for 3 columns, 2 rows, and float as the element type.

### QMatrix3x3

The QMatrix3x3 type defines a convenient instantiation of the QGenericMatrix template for 3 columns, 3 rows, and float as the element type.

### QMatrix3x4

The QMatrix3x4 type defines a convenient instantiation of the QGenericMatrix template for 3 columns, 4 rows, and float as the element type.

### QMatrix4x2

The QMatrix4x2 type defines a convenient instantiation of the QGenericMatrix template for 4 columns, 2 rows, and float as the element type.

### QMatrix4x3

The QMatrix4x3 type defines a convenient instantiation of the QGenericMatrix template for 4 columns, 3 rows, and float as the element type.

### template <int N, int M, typename T> QGenericMatrix<N, M, T> operator*(T factor, const QGenericMatrix<N, M, T> &matrix)

Returns the result of multiplying all elements of matrix by factor.

### template <int NN, int M1, int M2, typename TT> QGenericMatrix<M1, M2, TT> operator*(const QGenericMatrix<NN, M2, TT> &m1, const QGenericMatrix<M1, NN, TT> &m2)

Returns the product of the NNxM2 matrix m1 and the M1xNN matrix m2 to produce a M1xM2 matrix result.

### template <int N, int M, typename T> QGenericMatrix<N, M, T> operator*(const QGenericMatrix<N, M, T> &matrix, T factor)

Returns the result of multiplying all elements of matrix by factor.

### template <int N, int M, typename T> QGenericMatrix<N, M, T> operator+(const QGenericMatrix<N, M, T> &m1, const QGenericMatrix<N, M, T> &m2)

Returns the sum of m1 and m2.

### template <int N, int M, typename T> QGenericMatrix<N, M, T> operator-(const QGenericMatrix<N, M, T> &m1, const QGenericMatrix<N, M, T> &m2)

Returns the difference of m1 and m2.

### template <int N, int M, typename T> QGenericMatrix<N, M, T> operator-(const QGenericMatrix<N, M, T> &matrix)

Returns the negation of matrix.

This is an overloaded function.

### template <int N, int M, typename T> QGenericMatrix<N, M, T> operator/(const QGenericMatrix<N, M, T> &matrix, T divisor)

Returns the result of dividing all elements of matrix by divisor.

### template <int N, int M, typename T> QDataStream &operator<<(QDataStream &stream, const QGenericMatrix<N, M, T> &matrix)

Writes the given matrix to the given stream and returns a reference to the stream.

See also Serializing Qt Data Types.

### template <int N, int M, typename T> QDataStream &operator>>(QDataStream &stream, QGenericMatrix<N, M, T> &matrix)

Reads a NxM matrix from the given stream into the given matrix and returns a reference to the stream.

See also Serializing Qt Data Types.