eigen/Tutorial__commainit__02_8cpp_source.html

 int rows=5, cols=5;

 MatrixXf m(rows,cols);

 m << (Matrix3f() << 1, 2, 3, 4, 5, 6, 7, 8, 9).finished(),

      MatrixXf::Zero(3,cols-3),

      MatrixXf::Zero(rows-3,3),

      MatrixXf::Identity(rows-3,cols-3);

 cout << m;

rows
int rows
Definition: Tutorial_commainit_02.cpp:1

cols
int cols
Definition: Tutorial_commainit_02.cpp:1

m
MatrixXf m(rows, cols)

Eigen::Matrix3f
Matrix< float, 3, 3 > Matrix3f
3×3 matrix of type float.
Definition: Matrix.h:501

Eigen::MatrixXf
Matrix< float, Dynamic, Dynamic > MatrixXf
Dynamic×Dynamic matrix of type float.
Definition: Matrix.h:501