| MatrixXd A(3, 3); |
| A << 4, -1, 2, -1, 6, 0, 2, 0, 5; |
| cout << "The matrix A is" << endl << A << endl; |
| |
| LLT<MatrixXd> lltOfA(A); // compute the Cholesky decomposition of A |
| MatrixXd L = lltOfA.matrixL(); // retrieve factor L in the decomposition |
| // The previous two lines can also be written as "L = A.llt().matrixL()" |
| |
| cout << "The Cholesky factor L is" << endl << L << endl; |
| cout << "To check this, let us compute L * L.transpose()" << endl; |
| cout << L * L.transpose() << endl; |
| cout << "This should equal the matrix A" << endl; |
