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- MatrixXd X = MatrixXd::Random(4,4);
- MatrixXd A = X * X.transpose();
- cout << "Here is a random positive-definite matrix, A:" << endl << A << endl << endl;
- SelfAdjointEigenSolver<MatrixXd> es(A);
- cout << "The inverse square root of A is: " << endl;
- cout << es.operatorInverseSqrt() << endl;
- cout << "We can also compute it with operatorSqrt() and inverse(). That yields: " << endl;
- cout << es.operatorSqrt().inverse() << endl;
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