xref: /aosp_15_r20/external/eigen/doc/snippets/SelfAdjointEigenSolver_operatorSqrt.cpp (revision bf2c37156dfe67e5dfebd6d394bad8b2ab5804d4) 
1*bf2c3715SXin Li MatrixXd X = MatrixXd::Random(4,4);
2*bf2c3715SXin Li MatrixXd A = X * X.transpose();
3*bf2c3715SXin Li cout << "Here is a random positive-definite matrix, A:" << endl << A << endl << endl;
4*bf2c3715SXin Li 
5*bf2c3715SXin Li SelfAdjointEigenSolver<MatrixXd> es(A);
6*bf2c3715SXin Li MatrixXd sqrtA = es.operatorSqrt();
7*bf2c3715SXin Li cout << "The square root of A is: " << endl << sqrtA << endl;
8*bf2c3715SXin Li cout << "If we square this, we get: " << endl << sqrtA*sqrtA << endl;
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