xref: /aosp_15_r20/external/eigen/doc/snippets/Tridiagonalization_packedMatrix.cpp (revision bf2c37156dfe67e5dfebd6d394bad8b2ab5804d4)
1*bf2c3715SXin Li Matrix4d X = Matrix4d::Random(4,4);
2*bf2c3715SXin Li Matrix4d A = X + X.transpose();
3*bf2c3715SXin Li cout << "Here is a random symmetric 4x4 matrix:" << endl << A << endl;
4*bf2c3715SXin Li Tridiagonalization<Matrix4d> triOfA(A);
5*bf2c3715SXin Li Matrix4d pm = triOfA.packedMatrix();
6*bf2c3715SXin Li cout << "The packed matrix M is:" << endl << pm << endl;
7*bf2c3715SXin Li cout << "The diagonal and subdiagonal corresponds to the matrix T, which is:"
8*bf2c3715SXin Li      << endl << triOfA.matrixT() << endl;
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