| // SPDX-FileCopyrightText: The Eigen Authors |
| // SPDX-License-Identifier: MPL-2.0 |
| |
| Matrix2f M = Matrix2f::Random(); |
| Matrix2f m; |
| m = M; |
| cout << "Here is the matrix m:" << endl << m << endl; |
| cout << "Now we want to copy a column into a row." << endl; |
| cout << "If we do m.col(1) = m.row(0), then m becomes:" << endl; |
| m.col(1) = m.row(0); |
| cout << m << endl << "which is wrong!" << endl; |
| cout << "Now let us instead do m.col(1) = m.row(0).eval(). Then m becomes" << endl; |
| m = M; |
| m.col(1) = m.row(0).eval(); |
| cout << m << endl << "which is right." << endl; |
