\returns the number of rows */

Compute the LU supernodal factorization of \p matrix. * iparm and dparm can be used to tune the PaStiX parameters. * see the PaStiX user

Compute the L factor of the LL^T supernodal factorization of \p matrix * \sa analyzePattern() factorize() */

Compute the L and D factors of the LDL^T factorization of \p matrix * \sa analyzePattern() factorize() */

Computes the sparse Cholesky decomposition of \a matrix */

Computes the QR factorization of the sparse matrix \a mat. * * \warning The matrix \a mat must be in compressed mode (see SparseMatrix::m