Module DGMRES in IMSLM

• IMSLM Information

• Components
  • Documentation from ITL

DGMRES

 
Solves large, sparse systems of linear equations, using the GMRES (generalized
minimum residual) iterative method with reverse communication. The
coefficient matrix need have no special structure and can be stored using any
scheme. The user must provide an initial guess for the solution. (Based on GMRESD
by Homer Walker.).
 
Classes  :  D2a4 . Solution of systems of linear equations, including matrix
                 inverses, and LU and related factorizations (real
                 nonsymmetric sparse matrices)
 
Type     : Fortran subroutine in IMSLM library.
Access   : Proprietary. Many implementations available.
Precision: Double.
 
Usage    : CALL DGMRES (IDO, N, X, P, R, Z, TOL)
 
Details  : Documentation
Sites    : (1) ITL
 

Implementation of DGMRES from IMSLM on ITL

 
ITL:       Unix Workstation Network, National Institute of Standards and
           Technology (NIST), Gaithersburg, MD. Available to NIST staff.
 
Precision: Double. (Single: GMRES)
 
Access available only to NIST staff on internal Unix systems. They may access this
package provided the /itl tree is cross-mounted.
 
   Link         : Login to spruce.nist.gov and see ITL How-To for
                  information on how to setup your environment and link.
   Documentation: cat
                  /home/fetch/Subjects/Math-Stat-Software/imsl/Documentation/dgmres