Module ZGECON in LAPACK

General Information

Estimates the reciprocal of the condition number of a general matrix, in either the 1-norm or the infinity-norm, using the LU factorization computed by ZGETRF. (Computational routine.).

Usage

CALL ZGECON( NORM, N, A, LDA, ANORM, RCOND, WORK, RWORK, INFO )

Classification

D2c1	Solution of systems of linear equations, including matrix inverses, and LU and related factorizations (general complex non-Hermitian matrices)

Type

subroutine in LAPACK package (COMPLEX16 sublibrary)

Language

Fortran

Availability

Public domain, Portable

Precision

Double Precision

Alternates

CGECON

Single Precision

See also

ZGETRF

Download from NETLIB; Public access repository

Location

The University of Tennessee at Knoxville and Bell Laboratories

Contact

Jack Dongarra, ORNL (dongarra@cs.utk.edu) and Eric Grosse, Bell Labs (ehg@research.att.com)

Installation on ARNO; Silicon Graphics Origin 2000

Location

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

Contact

Gaithersburg Consulting Office: 301-975-2968, consult@nist.gov

Usage

Those logged in to arno.nist.gov or amur.nist.gov may access this module as follows.

Documentation

man zgecon

To Link

f90 prog.f -lscs (or -lscs_mp for multiprocessor version)

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.

NeededBLAS

Can be downloaded from netlib

To Link

f77 -o myprog myprog.f -llapack -lblas