slasq5.f (3) - Linux Man Pages
subroutine slasq5 (integerI0, integerN0, real, dimension( * )Z, integerPP, realTAU, realSIGMA, realDMIN, realDMIN1, realDMIN2, realDN, realDNM1, realDNM2, logicalIEEE, realEPS)
SLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr.
SLASQ5 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 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.
TAU is REAL This is the shift.
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).
IEEE is LOGICAL Flag for IEEE or non IEEE arithmetic.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
- September 2012
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