Class xlifepp::UmfPackLU

template<typename MatrixType>
class UmfPackLU

Wrapper class of Umfpack.

Public Types

typedef MatrixType::ScalarType ScalarType

scalar type of matrix (real_t or Complex)

Public Functions

inline UmfPackLU()

void constructor

inline UmfPackLU(const MatrixType &matrix)

constructor from matrix, perform factorisation

inline ~UmfPackLU()

destructor (deallocate umfpack structure)

inline void analyzePattern(const MatrixType &matrix)

Performs a symbolic decomposition on the sparcity of matrix.

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

See also

factorize(), compute()

inline number_t cols() const

accessor to number of matrix columns

inline void compute(const MatrixType &matrix)

Computes the sparse Cholesky decomposition of a matrix

inline void factorize(const MatrixType &matrix)

Performs a numeric decomposition of matrix The given matrix must has the same matrix on which the pattern analysis has been performed.

See also

analyzePattern(), compute()

inline ComputationInfo info() const

Reports whether previous computation was successful.

Returns:

Success if computation was succesful, NumericalIssue if the matrix.appears to be negative.

inline const LUMatrixType &matrixL() const

access to L factor

inline const LUMatrixType &matrixU() const

access to U factor

inline const std::vector<int> &permutationP() const

access to row permutation vector

inline const std::vector<int> &permutationQ() const

access to col permutation vector

inline number_t rows() const

accessor to number of matrix rows

inline const std::vector<real_t> &scaleFactorR() const

access to scale factors vector

struct LUMatrixType

structure to store matrix factors L and U