dlasq3.f - Online Linux Manual Page

Section : 3
Updated : Tue Nov 14 2017
Source : Version 3.8.0
Note : LAPACK
NAMEdlasq3.f
SYNOPSIS
Functions/Subroutinessubroutine dlasq3 (I0, N0, Z, PP, DMIN, SIGMA, DESIG, QMAX, NFAIL, ITER, NDIV, IEEE, TTYPE, DMIN1, DMIN2, DN, DN1, DN2, G, TAU)
DLASQ3 checks for deflation, computes a shift and calls dqds​. Used by sbdsqr​.
Function/Subroutine Documentation
subroutine dlasq3 (integer I0, integer N0, double precision, dimension( * ) Z, integer PP, double precision DMIN, double precision SIGMA, double precision DESIG, double precision QMAX, integer NFAIL, integer ITER, integer NDIV, logical IEEE, integer TTYPE, double precision DMIN1, double precision DMIN2, double precision DN, double precision DN1, double precision DN2, double precision G, double precision TAU)DLASQ3 checks for deflation, computes a shift and calls dqds​. Used by sbdsqr​. 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*N0 ) 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 Increment NFAIL by 1 each time the shift was too big.
ITER ITER is INTEGER Increment ITER by 1 for each iteration.
NDIV NDIV is INTEGER Increment NDIV by 1 for each division.
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: June 2016 Definition at line 184 of file dlasq3​.f​.
AuthorGenerated automatically by Doxygen for LAPACK from the source code​. 0
Johanes Gumabo
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