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third_party/eigen/doc/examples/TutorialLinAlgExSolveColPivHouseholderQR.cpp

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+#include <iostream>
+#include <Eigen/Dense>
+
+int main() {
+  Eigen::Matrix3f A;
+  Eigen::Vector3f b;
+  A << 1, 2, 3, 4, 5, 6, 7, 8, 10;
+  b << 3, 3, 4;
+  std::cout << "Here is the matrix A:\n" << A << std::endl;
+  std::cout << "Here is the vector b:\n" << b << std::endl;
+  Eigen::Vector3f x = A.colPivHouseholderQr().solve(b);
+  std::cout << "The solution is:\n" << x << std::endl;
+}