compile_EigenSolver_compute.cpp

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#include <Eigen/Core>
#include <Eigen/LU>
#include <Eigen/QR>
#include <Eigen/Cholesky>
#include <Eigen/Geometry>
#include <Eigen/Jacobi>
#include <Eigen/Eigenvalues>
#include <iostream>

using namespace Eigen;
using namespace std;

int main(int, char**)
{
  cout.precision(3);
  EigenSolver<MatrixXf> es;
MatrixXf A = MatrixXf::Random(4,4);
es.compute(A, /* computeEigenvectors = */ false);
cout << "The eigenvalues of A are: " << es.eigenvalues().transpose() << endl;
es.compute(A + MatrixXf::Identity(4,4), false); // re-use es to compute eigenvalues of A+I
cout << "The eigenvalues of A+I are: " << es.eigenvalues().transpose() << endl;

  return 0;
}