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slasq5.f(3) LAPACK slasq5.f(3)

NAME

slasq5.f -

SYNOPSIS

Functions/Subroutines


subroutine slasq5 (I0, N0, Z, PP, TAU, SIGMA, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, IEEE, EPS)
 
SLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr.

Function/Subroutine Documentation

subroutine slasq5 (integerI0, integerN0, real, dimension( * )Z, integerPP, realTAU, realSIGMA, realDMIN, realDMIN1, realDMIN2, realDN, realDNM1, realDNM2, logicalIEEE, realEPS)

SLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr.
Purpose: 
 SLASQ5 computes one dqds transform in ping-pong form, one
 version for IEEE machines another for non IEEE machines.
Parameters:
I0 
          I0 is INTEGER
        First index.
N0 
          N0 is INTEGER
        Last index.
Z 
          Z is REAL array, dimension ( 4*N )
        Z holds the qd array. EMIN is stored in Z(4*N0) to avoid
        an extra argument.
PP 
          PP is INTEGER
        PP=0 for ping, PP=1 for pong.
TAU 
          TAU is REAL
        This is the shift.
DMIN 
          DMIN is REAL
        Minimum value of d.
DMIN1 
          DMIN1 is REAL
        Minimum value of d, excluding D( N0 ).
DMIN2 
          DMIN2 is REAL
        Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN 
          DN is REAL
        d(N0), the last value of d.
DNM1 
          DNM1 is REAL
        d(N0-1).
DNM2 
          DNM2 is REAL
        d(N0-2).
IEEE 
          IEEE is LOGICAL
        Flag for IEEE or non IEEE arithmetic.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 132 of file slasq5.f.

Author

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