1Matrix3d m = 10000 * Matrix3d::Identity();
2m(0,2) = 1;
3cout << "Here's the matrix m:" << endl << m << endl;
4cout << "m.isDiagonal() returns: " << m.isDiagonal() << endl;
5cout << "m.isDiagonal(1e-3) returns: " << m.isDiagonal(1e-3) << endl;
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