initial commit

third_party/eigen/doc/snippets/FullPivLU_solve.cpp

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+Matrix<float, 2, 3> m = Matrix<float, 2, 3>::Random();
+Matrix2f y = Matrix2f::Random();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here is the matrix y:" << endl << y << endl;
+Matrix<float, 3, 2> x = m.fullPivLu().solve(y);
+if ((m * x).isApprox(y)) {
+  cout << "Here is a solution x to the equation mx=y:" << endl << x << endl;
+} else
+  cout << "The equation mx=y does not have any solution." << endl;