02-27-2008
use "/etc/profile"
hth,
DN2
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LEARN ABOUT DEBIAN
dlasq3
dlasq3.f(3) LAPACK dlasq3.f(3)
NAME
dlasq3.f -
SYNOPSIS
Functions/Subroutines
subroutine dlasq3 (I0, N0, Z, PP, DMIN, SIGMA, DESIG, QMAX, NFAIL, ITER, NDIV, IEEE, TTYPE, DMIN1, DMIN2, DN, DN1, DN2, G, TAU)
DLASQ3
Function/Subroutine Documentation
subroutine dlasq3 (integerI0, integerN0, double precision, dimension( * )Z, integerPP, double precisionDMIN, double precisionSIGMA, double
precisionDESIG, double precisionQMAX, integerNFAIL, integerITER, integerNDIV, logicalIEEE, integerTTYPE, double precisionDMIN1, double
precisionDMIN2, double precisionDN, double precisionDN1, double precisionDN2, double precisionG, double precisionTAU)
DLASQ3
Purpose:
DLASQ3 checks for deflation, computes a shift (TAU) and calls dqds.
In case of failure it changes shifts, and tries again until output
is positive.
Parameters:
I0
I0 is INTEGER
First index.
N0
N0 is INTEGER
Last index.
Z
Z is DOUBLE PRECISION array, dimension ( 4*N )
Z holds the qd array.
PP
PP is INTEGER
PP=0 for ping, PP=1 for pong.
PP=2 indicates that flipping was applied to the Z array
and that the initial tests for deflation should not be
performed.
DMIN
DMIN is DOUBLE PRECISION
Minimum value of d.
SIGMA
SIGMA is DOUBLE PRECISION
Sum of shifts used in current segment.
DESIG
DESIG is DOUBLE PRECISION
Lower order part of SIGMA
QMAX
QMAX is DOUBLE PRECISION
Maximum value of q.
NFAIL
NFAIL is INTEGER
Number of times shift was too big.
ITER
ITER is INTEGER
Number of iterations.
NDIV
NDIV is INTEGER
Number of divisions.
IEEE
IEEE is LOGICAL
Flag for IEEE or non IEEE arithmetic (passed to DLASQ5).
TTYPE
TTYPE is INTEGER
Shift type.
DMIN1
DMIN1 is DOUBLE PRECISION
DMIN2
DMIN2 is DOUBLE PRECISION
DN
DN is DOUBLE PRECISION
DN1
DN1 is DOUBLE PRECISION
DN2
DN2 is DOUBLE PRECISION
G
G is DOUBLE PRECISION
TAU
TAU is DOUBLE PRECISION
These are passed as arguments in order to save their values
between calls to DLASQ3.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
April 2012
Definition at line 181 of file dlasq3.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.1 Sun May 26 2013 dlasq3.f(3)