NSPCG (Nonsymmetric Preconditioned Conjugate Gradient) user's guide: Version 1. 0: A package for solving large sparse linear systems by various iterative methods
Thomas C. Oppe, DOE/ER, NSF, Wayne D. Joubert, David R. Kincaid · 1988
NSPCG (or Nonsymmetric Preconditioned Conjugate Gradient) is a computer package to solve the linear system Au = b by various iterative methods. The coefficient matrix A is assumed to be large and sparse with real coefficients. A wide selection of preconditioners and accelerators is available for both symmetric and nonsymmetric coefficient matrices. Several sparse matrix data structures are available to represent matrices whose structures range from highly structures to completely unstructured. 36 refs., 8 tabs.