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third_party/eigen/doc/snippets/ColPivHouseholderQR_solve.cpp

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+Matrix3f m = Matrix3f::Random();
+Matrix3f y = Matrix3f::Random();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here is the matrix y:" << endl << y << endl;
+Matrix3f x;
+x = m.colPivHouseholderQr().solve(y);
+assert(y.isApprox(m* x));
+cout << "Here is a solution x to the equation mx=y:" << endl << x << endl;