doc/snippets/Tutorial_solve_triangular_inplace.cpp

// SPDX-FileCopyrightText: The Eigen Authors
// SPDX-License-Identifier: MPL-2.0

Matrix3f A;
Vector3f b;
A << 1, 2, 3, 0, 5, 6, 0, 0, 10;
b << 3, 3, 4;
A.triangularView<Upper>().solveInPlace(b);
cout << "The solution is:" << endl << b << endl;