1*bf2c3715SXin Li 2*bf2c3715SXin Linamespace Eigen { 3*bf2c3715SXin Li 4*bf2c3715SXin Li/** 5*bf2c3715SXin Li 6*bf2c3715SXin Li\eigenManualPage MatrixfreeSolverExample Matrix-free solvers 7*bf2c3715SXin Li 8*bf2c3715SXin LiIterative solvers such as ConjugateGradient and BiCGSTAB can be used in a matrix free context. To this end, user must provide a wrapper class inheriting EigenBase<> and implementing the following methods: 9*bf2c3715SXin Li - \c Index \c rows() and \c Index \c cols(): returns number of rows and columns respectively 10*bf2c3715SXin Li - \c operator* with your type and an %Eigen dense column vector (its actual implementation goes in a specialization of the internal::generic_product_impl class) 11*bf2c3715SXin Li 12*bf2c3715SXin Li\c Eigen::internal::traits<> must also be specialized for the wrapper type. 13*bf2c3715SXin Li 14*bf2c3715SXin LiHere is a complete example wrapping an Eigen::SparseMatrix: 15*bf2c3715SXin Li\include matrixfree_cg.cpp 16*bf2c3715SXin LiOutput: \verbinclude matrixfree_cg.out 17*bf2c3715SXin Li 18*bf2c3715SXin Li*/ 19*bf2c3715SXin Li 20*bf2c3715SXin Li}