| // SPDX-FileCopyrightText: The Eigen Authors | |
| // SPDX-License-Identifier: MPL-2.0 | |
| SparseMatrix<double> A(3, 3); | |
| A.insert(1, 2) = 0; | |
| A.insert(0, 1) = 1; | |
| A.insert(2, 0) = 2; | |
| A.makeCompressed(); | |
| cout << "The matrix A is:" << endl << MatrixXd(A) << endl; | |
| cout << "it has " << A.nonZeros() << " stored non zero coefficients that are: " << A.coeffs().transpose() << endl; | |
| A.coeffs() += 10; | |
| cout << "After adding 10 to every stored non zero coefficient, the matrix A is:" << endl << MatrixXd(A) << endl; |