DLASQ6(1) | LAPACK routine (version 3.2) | DLASQ6(1) |
NAME¶
DLASQ6 - computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow
SYNOPSIS¶
- SUBROUTINE DLASQ6(
- I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2 )
INTEGER I0, N0, PP DOUBLE PRECISION DMIN, DMIN1, DMIN2, DN, DNM1, DNM2 DOUBLE PRECISION Z( * )
PURPOSE¶
DLASQ6 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) 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).
November 2008 | LAPACK routine (version 3.2) |