CGAL 6.1.2 - CGAL and Solvers: Solver_interface/sparse_solvers.cpp

CGAL 6.1.2 - CGAL and Solvers

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Solver_interface/sparse_solvers.cpp
#include <CGAL/Eigen_solver_traits.h>
#include <CGAL/Eigen_matrix.h>
typedef CGAL::Eigen_solver_traits<> Eigen_solver;
typedef Eigen_solver::NT FT;
typedef Eigen_solver::Matrix Eigen_matrix;
typedef Eigen_solver::Vector Eigen_vector;
int main(void)
{
srand(static_cast<unsigned int>(time (nullptr)));
std::size_t degree = 3000;
std::size_t nb_nonzero_coef = 100;
Eigen_vector B(degree); // Zero vector
Eigen_matrix A(degree);
// Randomly make some coefficients of the matrix non-zero
for(std::size_t i=0; i<nb_nonzero_coef; ++i)
{
int x = rand() % degree;
int y = rand() % degree;
FT value = rand() / static_cast<FT>(RAND_MAX);
A.add_coef(x, y, value);
A.add_coef(y, x, value);
}
Eigen_vector X(degree);
FT d;
Eigen_solver solver;
if(!(solver.linear_solver(A, B, X, d)))
{
std::cerr << "Error: linear solver failed" << std::endl;
return -1;
}
std::cerr << "Linear solve succeeded" << std::endl;
return 0;
}
CGAL::Eigen_solver_traits
The class Eigen_solver_traits provides an interface to the sparse solvers of Eigen.
Definition: Eigen_solver_traits.h:101