| Brian Silverman | 72890c2 | 2015-09-19 14:37:37 -0400 | [diff] [blame] | 1 | Matrix2f M = Matrix2f::Random(); |
| 2 | Matrix2f m; |
| 3 | m = M; |
| 4 | cout << "Here is the matrix m:" << endl << m << endl; |
| 5 | cout << "Now we want to copy a column into a row." << endl; |
| 6 | cout << "If we do m.col(1) = m.row(0), then m becomes:" << endl; |
| 7 | m.col(1) = m.row(0); |
| 8 | cout << m << endl << "which is wrong!" << endl; |
| 9 | cout << "Now let us instead do m.col(1) = m.row(0).eval(). Then m becomes" << endl; |
| 10 | m = M; |
| 11 | m.col(1) = m.row(0).eval(); |
| 12 | cout << m << endl << "which is right." << endl; |