 Eigen  3.4.90 (git rev 67eeba6e720c5745abc77ae6c92ce0a44aa7b7ae) Eigen::PastixLU< MatrixType_, IsStrSym > Class Template Reference

## Detailed Description

### template<typename MatrixType_, bool IsStrSym> class Eigen::PastixLU< MatrixType_, IsStrSym >

Interface to the PaStix solver.

Sparse direct LU solver based on PaStiX library.

This class is used to solve the linear systems A.X = B via the PaStix library. The matrix can be either real or complex, symmetric or not.

TutorialSparseDirectSolvers

This class is used to solve the linear systems A.X = B with a supernodal LU factorization in the PaStiX library. The matrix A should be squared and nonsingular PaStiX requires that the matrix A has a symmetric structural pattern. This interface can symmetrize the input matrix otherwise. The vectors or matrices X and B can be either dense or sparse.

Template Parameters
 MatrixType_ the type of the sparse matrix A, it must be a SparseMatrix<> IsStrSym Indicates if the input matrix has a symmetric pattern, default is false NOTE : Note that if the analysis and factorization phase are called separately, the input matrix will be symmetrized at each call, hence it is advised to symmetrize the matrix in a end-user program and set IsStrSym to true

This class follows the sparse solver concept .

Sparse solver concept, class SparseLU

Inherits Eigen::PastixBase< Derived >.

## Public Member Functions

void analyzePattern (const MatrixType &matrix)

void compute (const MatrixType &matrix)

void factorize (const MatrixType &matrix)

## ◆ analyzePattern()

template<typename MatrixType_ , bool IsStrSym>
 void Eigen::PastixLU< MatrixType_, IsStrSym >::analyzePattern ( const MatrixType & matrix )
inline

Compute the LU symbolic factorization of matrix using its sparsity pattern. Several ordering methods can be used at this step. See the PaStiX user's manual. The result of this operation can be used with successive matrices having the same pattern as matrix

factorize()

## ◆ compute()

template<typename MatrixType_ , bool IsStrSym>
 void Eigen::PastixLU< MatrixType_, IsStrSym >::compute ( const MatrixType & matrix )
inline

Compute the LU supernodal factorization of matrix. iparm and dparm can be used to tune the PaStiX parameters. see the PaStiX user's manual

analyzePattern() factorize()

## ◆ factorize()

template<typename MatrixType_ , bool IsStrSym>
 void Eigen::PastixLU< MatrixType_, IsStrSym >::factorize ( const MatrixType & matrix )
inline

Compute the LU supernodal factorization of matrix WARNING The matrix matrix should have the same structural pattern as the same used in the analysis phase.