DLASQ6
Purpose
DLASQ6 computes one dqd (shift equal to zero) transform in
ping-pong form, with protection against underflow and overflow.
ping-pong form, with protection against underflow and overflow.
Arguments
| I0 |
(input) INTEGER
First index.
|
| N0 |
(input) INTEGER
Last index.
|
| Z |
(input) DOUBLE PRECISION 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) DOUBLE PRECISION
Minimum value of d.
|
| DMIN1 |
(output) DOUBLE PRECISION
Minimum value of d, excluding D( N0 ).
|
| DMIN2 |
(output) DOUBLE PRECISION
Minimum value of d, excluding D( N0 ) and D( N0-1 ).
|
| DN |
(output) DOUBLE PRECISION
d(N0), the last value of d.
|
| DNM1 |
(output) DOUBLE PRECISION
d(N0-1).
|
| DNM2 |
(output) DOUBLE PRECISION
d(N0-2).
|