dlasq4.f - Online Linux Manual Page

Section : 3
Updated : Tue Nov 14 2017
Source : Version 3.8.0
Note : LAPACK
NAMEdlasq4.f
SYNOPSIS
Functions/Subroutinessubroutine dlasq4 (I0, N0, Z, PP, N0IN, DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU, TTYPE, G)
DLASQ4 computes an approximation to the smallest eigenvalue using values of d from the previous transform​. Used by sbdsqr​.
Function/Subroutine Documentation
subroutine dlasq4 (integer I0, integer N0, double precision, dimension( * ) Z, integer PP, integer N0IN, double precision DMIN, double precision DMIN1, double precision DMIN2, double precision DN, double precision DN1, double precision DN2, double precision TAU, integer TTYPE, double precision G)DLASQ4 computes an approximation to the smallest eigenvalue using values of d from the previous transform​. Used by sbdsqr​. Purpose: DLASQ4 computes an approximation TAU to the smallest eigenvalue using values of d from the previous transform.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.
N0IN N0IN is INTEGER The value of N0 at start of EIGTEST.
DMIN DMIN is DOUBLE PRECISION Minimum value of d.
DMIN1 DMIN1 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ).
DMIN2 DMIN2 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN DN is DOUBLE PRECISION d(N)
DN1 DN1 is DOUBLE PRECISION d(N-1)
DN2 DN2 is DOUBLE PRECISION d(N-2)
TAU TAU is DOUBLE PRECISION This is the shift.
TTYPE TTYPE is INTEGER Shift type.
G G is DOUBLE PRECISION G is passed as an argument in order to save its value between calls to DLASQ4.Author: Univ​. of Tennessee Univ​. of California Berkeley Univ​. of Colorado Denver NAG Ltd​. Date: June 2016 Further Details: CNST1 = 9/16Definition at line 153 of file dlasq4​.f​.
AuthorGenerated automatically by Doxygen for LAPACK from the source code​. 0
Johanes Gumabo
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