Public Member Functions | List of all members
CholmodSimplicialLDLT< _MatrixType, _UpLo > Class Template Reference

A simplicial direct Cholesky (LDLT) factorization and solver based on Cholmod. More...

#include <CholmodSupport.h>

+ Inheritance diagram for CholmodSimplicialLDLT< _MatrixType, _UpLo >:

Public Member Functions

void analyzePattern (const MatrixType &matrix)
cholmod_common & cholmod ()
CholmodSimplicialLDLT
< _MatrixType, _UpLo > & 
compute (const MatrixType &matrix)
void factorize (const MatrixType &matrix)
ComputationInfo info () const
 Reports whether previous computation was successful.
const internal::solve_retval
< CholmodBase, Rhs > 
solve (const MatrixBase< Rhs > &b) const
const
internal::sparse_solve_retval
< CholmodBase, Rhs > 
solve (const SparseMatrixBase< Rhs > &b) const

Detailed Description

template<typename _MatrixType, int _UpLo = Lower>
class Eigen::CholmodSimplicialLDLT< _MatrixType, _UpLo >

A simplicial direct Cholesky (LDLT) factorization and solver based on Cholmod.

This class allows to solve for A.X = B sparse linear problems via a simplicial LDL^T Cholesky factorization using the Cholmod library. This simplicial variant is equivalent to Eigen's built-in SimplicialLDLT class. Thefore, it has little practical interest. The sparse matrix A must be selfajoint and positive definite. The vectors or matrices X and B can be either dense or sparse.

Template Parameters
_MatrixTypethe type of the sparse matrix A, it must be a SparseMatrix<>
_UpLothe triangular part that will be used for the computations. It can be Lower or Upper. Default is Lower.

This class supports all kind of SparseMatrix<>: row or column major; upper, lower, or both; compressed or non compressed.

See Also
Solving linear problems, class CholmodSupernodalLLT, class SimplicialLDLT

Member Function Documentation

void analyzePattern ( const MatrixType &  matrix)
inlineinherited

Performs a symbolic decomposition on the sparcity of matrix.

This function is particularly useful when solving for several problems having the same structure.

See Also
factorize()
cholmod_common& cholmod ( )
inlineinherited

Returns a reference to the Cholmod's configuration structure to get a full control over the performed operations. See the Cholmod user guide for details.

CholmodSimplicialLDLT< _MatrixType, _UpLo > & compute ( const MatrixType &  matrix)
inlineinherited

Computes the sparse Cholesky decomposition of matrix

void factorize ( const MatrixType &  matrix)
inlineinherited

Performs a numeric decomposition of matrix

The given matrix must has the same sparcity than the matrix on which the symbolic decomposition has been performed.

See Also
analyzePattern()
ComputationInfo info ( ) const
inlineinherited

Reports whether previous computation was successful.

Returns
Success if computation was succesful, NumericalIssue if the matrix.appears to be negative.
const internal::solve_retval<CholmodBase, Rhs> solve ( const MatrixBase< Rhs > &  b) const
inlineinherited
Returns
the solution x of $ A x = b $ using the current decomposition of A.
See Also
compute()
const internal::sparse_solve_retval<CholmodBase, Rhs> solve ( const SparseMatrixBase< Rhs > &  b) const
inlineinherited
Returns
the solution x of $ A x = b $ using the current decomposition of A.
See Also
compute()

The documentation for this class was generated from the following file: