initial commit

third_party/eigen/doc/examples/TutorialLinAlgSVDSolve.cpp

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+#include <iostream>
+#include <Eigen/Dense>
+
+int main() {
+  Eigen::MatrixXf A = Eigen::MatrixXf::Random(3, 2);
+  std::cout << "Here is the matrix A:\n" << A << std::endl;
+  Eigen::VectorXf b = Eigen::VectorXf::Random(3);
+  std::cout << "Here is the right hand side b:\n" << b << std::endl;
+  std::cout << "The least-squares solution is:\n"
+            << A.bdcSvd(Eigen::ComputeThinU | Eigen::ComputeThinV).solve(b) << std::endl;
+}