DLASQ5(1) | LAPACK routine (version 3.2) | DLASQ5(1) |
NAME¶
DLASQ5 - computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines
SYNOPSIS¶
- SUBROUTINE DLASQ5(
- I0, N0, Z, PP, TAU, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, IEEE )
LOGICAL IEEE INTEGER I0, N0, PP DOUBLE PRECISION DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, TAU DOUBLE PRECISION Z( * )
PURPOSE¶
DLASQ5 computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines.
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.
- TAU (input) DOUBLE PRECISION
- This is the shift.
- 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).
- IEEE (input) LOGICAL
- Flag for IEEE or non IEEE arithmetic.
November 2008 | LAPACK routine (version 3.2) |