slasq4.f (3)  Linux Manuals
NAME
slasq4.f 
SYNOPSIS
Functions/Subroutines
subroutine slasq4 (I0, N0, Z, PP, N0IN, DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU, TTYPE, G)
SLASQ4 computes an approximation to the smallest eigenvalue using values of d from the previous transform. Used by sbdsqr.
Function/Subroutine Documentation
subroutine slasq4 (integerI0, integerN0, real, dimension( * )Z, integerPP, integerN0IN, realDMIN, realDMIN1, realDMIN2, realDN, realDN1, realDN2, realTAU, integerTTYPE, realG)
SLASQ4 computes an approximation to the smallest eigenvalue using values of d from the previous transform. Used by sbdsqr.
Purpose:

SLASQ4 computes an approximation TAU to the smallest eigenvalue using values of d from the previous transform.
Parameters:

I0
I0 is INTEGER First index.
N0N0 is INTEGER Last index.
ZZ is REAL array, dimension ( 4*N ) Z holds the qd array.
PPPP is INTEGER PP=0 for ping, PP=1 for pong.
N0INN0IN is INTEGER The value of N0 at start of EIGTEST.
DMINDMIN is REAL Minimum value of d.
DMIN1DMIN1 is REAL Minimum value of d, excluding D( N0 ).
DMIN2DMIN2 is REAL Minimum value of d, excluding D( N0 ) and D( N01 ).
DNDN is REAL d(N)
DN1DN1 is REAL d(N1)
DN2DN2 is REAL d(N2)
TAUTAU is REAL This is the shift.
TTYPETTYPE is INTEGER Shift type.
GG is REAL G is passed as an argument in order to save its value between calls to SLASQ4.
Author:

Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
 September 2012
Further Details:

CNST1 = 9/16
Definition at line 151 of file slasq4.f.
Author
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