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To start using QGenericMatrix in your Qt project, you need to follow these steps:

1. Include the header file for QGenericMatrix:

#include <QGenericMatrix>

1. Declare a variable of type QGenericMatrix with the desired dimensions and data type:

QGenericMatrix<3, 3, float> matrix;

This creates a 3x3 matrix with float data type.

1. To set the values in the matrix, you can use the setRow() or setColumn() methods:

matrix.setRow(0, QVector3D(1.0f, 0.0f, 0.0f));
matrix.setRow(1, QVector3D(0.0f, 1.0f, 0.0f));
matrix.setRow(2, QVector3D(0.0f, 0.0f, 1.0f));

This sets the values of the identity matrix to the variable 'matrix'.

1. You can retrieve the values of a particular row or column using the row() or column() methods:

QVector3D row = matrix.row(1);
QVector3D column = matrix.column(2);

1. You can perform matrix operations such as multiplication using the * operator:

QGenericMatrix<3, 3, float> result = matrix * matrix;

This multiplies the matrix with itself and stores the result in 'result'.

Overall, QGenericMatrix provides a convenient way to work with matrices of various dimensions and data types.