DLASQ6 - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)

NAMEDLASQ6 - computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow

SYNOPSISSUBROUTINE 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( * )

PURPOSEDLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow.

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. 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).
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