SLASQ6 - compute one dqd (shift equal to zero) transform
in ping-pong form, with protection against underflow and
overflow
SYNOPSIS
SUBROUTINE SLASQ6( I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN,
DNM1, DNM2 )
INTEGER I0, N0, PP
REAL DMIN, DMIN1, DMIN2, DN, DNM1, DNM2
REAL Z( * )
PURPOSE
SLASQ6 computes one dqd (shift equal to zero) transform in
ping-pong form, with protection against underflow and
overflow.
ARGUMENTS
I0 (input) INTEGER
First index.
N0 (input) INTEGER
Last index.
Z (input) REAL array, dimension ( 4*N )
Z holds the qd array. EMIN is stored in Z(4*N0) to
avoid an extra argument.
PP (input) INTEGER
PP=0 for ping, PP=1 for pong.
DMIN (output) REAL
Minimum value of d.
DMIN1 (output) REAL Minimum value of d, excluding D(
N0 ).
DMIN2 (output) REAL Minimum value of d, excluding D(
N0 ) and D( N0-1 ).
DN (output) REAL
d(N0), the last value of d.
DNM1 (output) REAL
d(N0-1).
DNM2 (output) REAL
d(N0-2).
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