A package for solving large sparse linear systems by various iterative methods. 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, including a matrix-free format in which the user supplies basic matrix-vector operations. Designed for efficient use on vector processors. Classes : D2a4 . Solution of systems of linear equations, including matrix inverses, and LU and related factorizations (real nonsymmetric sparse matrices) D2b4 . Solution of systems of linear equations, including matrix inverses, and LU and related factorizations (real symmetric sparse matrices) Type : Fortran subroutine in ITPACK package. Access : Public domain. Portable. Precision: Single. Note : Manual and Quick-Reference are Postscript documents Usage : CALL NSPCG (PRECON, ACCEL, NDIM, MDIM, N, MAXNZ, COEF, JCOEF, P, IP, U, UBAR, RHS, WKSP, IWKSP, NW, INW, IPARM, RPARM, IER) Details : Fullsource Manual Quick-Reference Quick-reference Test-1 Test-2 Test-3 Test-4 Test-5 Sites : (1) ARNO (2) NETLIB
ARNO: Silicon Graphics Origin 2000, National Institute of Standards and Technology (NIST), Gaithersburg, MD. Available to NIST staff. Precision: Single. Note : Manual and Quick-Reference are Postscript documents Those logged in to arno.nist.gov or amur.nist.gov may access this module as follows. Access : See nspcg man page. Quick-Referen: lpr /usr/local/apps/nspcg/doc/quick.ref.ps Manual : lpr /usr/local/apps/nspcg/doc/nspcg.guide.ps
NETLIB: Public access repository, The University of Tennessee at Knoxville and Bell Laboratories Precision: Single. Note : Manual and Quick-Reference are Postscript documents You may access components from NETLIB outside GAMS as follows. Fullsource : echo 'send nspcg1.f nspcg2.f nspcg3.f nspcg4.f nspcg5.f from ITPACK' | mail netlib@ornl.gov Quick-referen: echo 'send quick.tex from ITPACK' | mail netlib@ornl.gov Manual : echo 'send usernsp.tex from ITPACK' | mail netlib@ornl.gov Test-3 : echo 'send tstnsp3.f from ITPACK' | mail netlib@ornl.gov Test-2 : echo 'send tstnsp2.f from ITPACK' | mail netlib@ornl.gov Test-1 : echo 'send tstnsp1.f from ITPACK' | mail netlib@ornl.gov Test-5 : echo 'send tstnsp5.f from ITPACK' | mail netlib@ornl.gov Test-4 : echo 'send tstnsp4.f from ITPACK' | mail netlib@ornl.gov
GAMS is a service of the Mathematical and Computational Sciences Division of the Information Technology Laboratory of the National Institute of Standards and Technology
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