CGAL 4.7 - Planar Parameterization of Triangulated Surface Meshes: CGAL::Eigen_solver_traits< T > Class Template Reference

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CGAL 4.7 - Planar Parameterization of Triangulated Surface Meshes

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CGAL::Eigen_solver_traits< T > Class Template Reference
Sparse Linear Algebra

`#include <include/CGAL/Eigen_solver_traits.h>`

## Definition

The class `Eigen_solver_traits` provides an interface to the sparse solvers of Eigen.

The version 3.1 (or greater) of Eigen must be available on the system.

Is Model Of:
  `SparseLinearAlgebraTraitsWithFactor_d` and `NormalEquationSparseLinearAlgebraTraits_d`

## Parameters

`T`: a sparse solver of Eigen. The default solver is the iterative bi-congugate gradient stabilized solver `Eigen::BiCGSTAB` for `double`.

See Also
  `CGAL::Eigen_sparse_matrix<T>`
  `CGAL::Eigen_sparse_symmetric_matrix<T>`
  `CGAL::Eigen_vector<T>`
  http://eigen.tuxfamily.org

## Example

The instantiation of this class assumes an Eigen sparse solver is provided. Here are few examples:

typedef CGAL::Eigen_sparse_matrix<double>::EigenType EigenMatrix;
//iterative general solver
typedef CGAL::Eigen_solver_traits< Eigen::BiCGSTAB<EigenMatrix> > Iterative_general_solver;
//iterative symmetric solver
typedef CGAL::Eigen_solver_traits< Eigen::ConjugateGradient<EigenMatrix> > Iterative_symmetric_solver;
//direct symmetric solver
typedef CGAL::Eigen_solver_traits< Eigen::SimplicialCholesky<EigenMatrix> > Direct_symmetric_solver;

Examples:
  Surface_mesh_parameterization/Complete_parameterization_example.cpp, and Surface_mesh_parameterization/Eigen_parameterization.cpp.

## Types

typedef T::Scalar | NT
typedef CGAL::Eigen_vector< NT > | Vector
typedef unspecified_type | Matrix
| If `T` is `Eigen::ConjugateGradient<M>` or `Eigen::SimplicialCholesky<M>`, `Matrix` is `CGAL::Eigen_sparse_symmetric_matrix<T>` and `CGAL::Eigen_sparse_matrix<T>` otherwise.

## Operations

T & | solver ()
| Returns a reference to the internal Eigen solver. More...

## Member Function Documentation

template<typename T >

T& CGAL::Eigen_solver_traits< T >::solver | ( | ) |  |

Returns a reference to the internal Eigen solver.

This function can be used for example to set specific parameters of the solver.