DQCGLS(3)

SYNOPSIS
SUBROUTINE DQCGLS (LUN, KPRINT, IPASS)

NAME
dqcgls - Quick check for DGLSS.

LIBRARY
SLATEC

TYPE
DOUBLE PRECISION (QCGLSS-S, DQCGLS-D)

AUTHOR
Voorhees, E. A., (LANL)

DESCRIPTION
QUICK CHECK SUBROUTINE DQCGLS TESTS THE EXECUTION OF THE GENERAL LINEAR SYSTEM SOLVER, DGLSS . THE DGLSS SUBROUTINE PACKAGE WAS WRITTEN BY T. MANTEUFFEL (LANL). A TITLE LINE AND A SUMMARY LINE ARE ALWAYS OUTPUTTED BY DQCGLS. THE SUMMARY LINE GIVES A COUNT OF THE NUMBER OF PROBLEMS DETECTED DURING THE TEST. THE REAL QUANTITIES FOR THE COMPUTED SOLUTION VECTOR X AND THE CORRESPONDING RNORM ARE COMPARED AGAINST STORED VALUES. DISAGREEMENT OCCURS IF A DIFFERENCE IS SQRT(D1MACH(4) OR MORE. THE RETURNED VALUE (INTEGER) OF INFO IS ALSO CHECKED. FOUR CASES ARE RUN, TWO INVOLVING LLSIA AND TWO INVOLVING ULSIA . DQCGLS REQUIRES NO INPUT ARGUMENTS. ON RETURN, NERR (INTEGER TYPE) CONTAINS THE COUNT OF THE NUMBER OF PROBLEMS DETECTED BY QCGLSS .

ROUTINES CALLED
D1MACH, DGLSS

REVISION HISTORY (YYMMDD)
811026 DATE WRITTEN
850601 REVISION DATE from Version 3.2
891214 Prologue converted to Version 4.0 format. (BAB)
901010 Restructured using IF-THEN-ELSE-ENDIF, cleaned up FORMATs, including removing an illegal character from column 1, and editorial changes. (RWC)