Vehicle-cpp/zjw/工控机安装资料/eigen-3.4.0/doc/snippets/MatrixBase_eigenvalues.cpp

MatrixXd ones = MatrixXd::Ones(3,3);
VectorXcd eivals = ones.eigenvalues();
cout << "The eigenvalues of the 3x3 matrix of ones are:" << endl << eivals << endl;