Solver_interface/singular_value_decomposition.cpp

#ifdef CGAL_EIGEN3_ENABLED
#include <CGAL/Eigen_matrix.h>
#include <CGAL/Eigen_vector.h>
#include <CGAL/Eigen_svd.h>
typedef CGAL::Eigen_svd Svd;
#endif
 
typedef Svd::FT     FT;
typedef Svd::Vector Eigen_vector;
typedef Svd::Matrix Eigen_matrix;
 
int main(void)
{
  std::size_t degree = 3;
 
  Eigen_vector B(degree);
  Eigen_matrix M(degree, degree);
 
  // Fill B and M with random numbers
  for(std::size_t i=0; i<degree; ++i)
  {
    B.set(i, rand());
    for(std::size_t j = 0; j < degree; ++j)
      M.set(i, j, rand());
  }
 
  // Solve MX=B
  std::cout << Svd::solve(M, B) << std::endl;
 
  // Print result
  std::cout << "Solution of SVD = [ ";
  for(std::size_t i=0; i<degree; ++i)
    std::cout << B.vector()[i] << " ";
  std::cout << "]" << std::endl;
 
  return 0;
}