slasq6.f (3) - Linux Man Pages
subroutine slasq6 (integerI0, integerN0, real, dimension( * )Z, integerPP, realDMIN, realDMIN1, realDMIN2, realDN, realDNM1, realDNM2)
SLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.
SLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow.
I0 is INTEGER First index.
N0 is INTEGER Last index.
Z is REAL 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.
DMIN is REAL Minimum value of d.
DMIN1 is REAL Minimum value of d, excluding D( N0 ).
DMIN2 is REAL Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN is REAL d(N0), the last value of d.
DNM1 is REAL d(N0-1).
DNM2 is REAL d(N0-2).
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
- September 2012
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