Module DGMRES in IMSLM

General Information

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.).

Usage

CALL DGMRES (IDO, N, X, P, R, Z, TOL)

Classification

D2a4	Solution of systems of linear equations, including matrix inverses, and LU and related factorizations (real nonsymmetric sparse matrices)

Type

subroutine in IMSLM package

Language

Fortran

Availability

Proprietary, Portable

Precision

Double Precision

Alternates

GMRES

Single Precision

Installation on ITL; Unix Workstation Network

Location

National Institute of Standards and Technology (NIST), Gaithersburg, MD.

Contact

Gaithersburg Consulting Office: 301-975-2968 (FTS 879-2968)

Usage

Access available only to NIST staff on internal Unix systems. They may access this package provided the /itl tree is cross-mounted.

Documentation

cat /home/fetch/Subjects/Math-Stat-Software/imsl/Documentation/dgmres

To Link

Login to spruce.nist.gov and see ITL How-To for information on how to setup your environment and link.