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). 0
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