COSC-4P80-Assignment-2/lib/eigen-3.4.0/doc/snippets/MatrixBase_selfadjointView.cpp

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Matrix3i m = Matrix3i::Random();
cout << "Here is the matrix m:" << endl << m << endl;
cout << "Here is the symmetric matrix extracted from the upper part of m:" << endl
<< Matrix3i(m.selfadjointView<Upper>()) << endl;
cout << "Here is the symmetric matrix extracted from the lower part of m:" << endl
<< Matrix3i(m.selfadjointView<Lower>()) << endl;