huoyi_deploy/third_party/eigen/doc/snippets/TopicAliasing_mult5.cpp

MatrixXf A(2, 2), B(3, 2);
B << 2, 0, 0, 3, 1, 1;
A << 2, 0, 0, -2;
A = (B * A).eval().cwiseAbs();
cout << A;