xref: /aosp_15_r20/external/eigen/doc/snippets/SelfAdjointEigenSolver_SelfAdjointEigenSolver.cpp (revision bf2c37156dfe67e5dfebd6d394bad8b2ab5804d4) 
1*bf2c3715SXin Li SelfAdjointEigenSolver<Matrix4f> es;
2*bf2c3715SXin Li Matrix4f X = Matrix4f::Random(4,4);
3*bf2c3715SXin Li Matrix4f A = X + X.transpose();
4*bf2c3715SXin Li es.compute(A);
5*bf2c3715SXin Li cout << "The eigenvalues of A are: " << es.eigenvalues().transpose() << endl;
6*bf2c3715SXin Li es.compute(A + Matrix4f::Identity(4,4)); // re-use es to compute eigenvalues of A+I
7*bf2c3715SXin Li cout << "The eigenvalues of A+I are: " << es.eigenvalues().transpose() << endl;
8