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slasq6.f(3) LAPACK slasq6.f(3)

NAME

slasq6.f -

SYNOPSIS

Functions/Subroutines


subroutine slasq6 (I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2)
 
SLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

Function/Subroutine Documentation

subroutine slasq6 (integerI0, integerN0, real, dimension( * )Z, integerPP, realDMIN, realDMIN1, realDMIN2, realDN, realDNM1, realDNM2)

SLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.
Purpose: 
 SLASQ6 computes one dqd (shift equal to zero) transform in
 ping-pong form, with protection against underflow and overflow.
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.
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).
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 119 of file slasq6.f.

Author

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