DLASQ5 - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)
NAMEDLASQ5 - computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines
SYNOPSISSUBROUTINE 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( * )
PURPOSEDLASQ5 computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines.
ARGUMENTSI0 (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. 0
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