Module PRECG in NAPACK

• NAPACK Information

• Components
  • Fullsource from NETLIB
  • Source from NETLIB

PRECG

 
Solves a system of linear equations to a specified number of correct digits using
preconditioned conjugate gradients. The user must provide a subroutine to
multiply the matrix by a vector and a preconditioning subroutine.
 
Classes  :  D2a4 . Solution of systems of linear equations, including matrix
                 inverses, and LU and related factorizations (real
                 nonsymmetric sparse matrices)
 
Type     : Fortran subroutine in NAPACK package.
Access   : Some uses prohibited. Portable.
Precision: Single.
 
Usage    : CALL PRECG (X, DIF, SIZE, NDIGIT, LIMIT, B, N, MULT, PRE, W)
 
Details  : Fullsource Source
Sites    : (1) NETLIB
 

Implementation of PRECG from NAPACK on NETLIB

 
NETLIB:    Public access repository, The University of Tennessee at
           Knoxville and Bell Laboratories
 
Precision: Single.
 
You may access components from NETLIB outside GAMS as follows.
 
   Source       : echo 'send only precg from napack' | mail netlib@ornl.gov
   Fullsource   : echo 'send precg from napack' | mail netlib@ornl.gov