dlasq5.f (3) - Linux Man Pages
subroutine dlasq5 (integerI0, integerN0, double precision, dimension( * )Z, integerPP, double precisionTAU, double precisionSIGMA, double precisionDMIN, double precisionDMIN1, double precisionDMIN2, double precisionDN, double precisionDNM1, double precisionDNM2, logicalIEEE, double precisionEPS)
DLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr.
DLASQ5 computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines.
I0 is INTEGER First index.
N0 is INTEGER Last index.
Z is DOUBLE PRECISION array, dimension ( 4*N ) Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra argument.
PP is INTEGER PP=0 for ping, PP=1 for pong.
TAU is DOUBLE PRECISION This is the shift.
SIGMA is DOUBLE PRECISION This is the accumulated shift up to this step.
DMIN is DOUBLE PRECISION Minimum value of d.
DMIN1 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ).
DMIN2 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN is DOUBLE PRECISION d(N0), the last value of d.
DNM1 is DOUBLE PRECISION d(N0-1).
DNM2 is DOUBLE PRECISION d(N0-2).
IEEE is LOGICAL Flag for IEEE or non IEEE arithmetic.
EPS is DOUBLE PRECISION This is the value of epsilon used.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
- September 2012
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