Looks for two consecutive small subdiagonal elements.
Performs the orthogonal/unitary similarity transformation of a Hessenberg matrix to detect and deflate fully converged eigenvalues from a trailing principal submatrix (aggressive early deflation).
Multiplies a general rectangular matrix by a real scalar defined as
Multiplies a general matrix by the orthogonal/unitary matrix from a QL factorization determined by p?geqlf (unblocked algorithm).
Computes scaled eigenvector corresponding to given eigenvalue.
Computes an LU factorization of a general tridiagonal matrix with no pivoting (local blocked algorithm).
Calculates the solution of a set of sparse linear equations with single or multiple right-hand sides, 64-bit integer version.
Initializes the solver.
ILUT preconditioner based on the incomplete LU factorization with a threshold of a sparse matrix.