initial commit

third_party/eigen/doc/examples/TutorialLinAlgSelfAdjointEigenSolver.cpp

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+#include <iostream>
+#include <Eigen/Dense>
+
+int main() {
+  Eigen::Matrix2f A;
+  A << 1, 2, 2, 3;
+  std::cout << "Here is the matrix A:\n" << A << std::endl;
+  Eigen::SelfAdjointEigenSolver<Eigen::Matrix2f> eigensolver(A);
+  if (eigensolver.info() != Eigen::Success) abort();
+  std::cout << "The eigenvalues of A are:\n" << eigensolver.eigenvalues() << std::endl;
+  std::cout << "Here's a matrix whose columns are eigenvectors of A \n"
+            << "corresponding to these eigenvalues:\n"
+            << eigensolver.eigenvectors() << std::endl;
+}