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slasq3.f(3) | LAPACK | slasq3.f(3) |
NAME¶
slasq3.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine slasq3 (I0, N0, Z, PP, DMIN, SIGMA, DESIG, QMAX, NFAIL, ITER, NDIV, IEEE, TTYPE, DMIN1, DMIN2, DN, DN1, DN2, G, TAU)
Function/Subroutine Documentation¶
subroutine slasq3 (integerI0, integerN0, real, dimension( * )Z, integerPP, realDMIN, realSIGMA, realDESIG, realQMAX, integerNFAIL, integerITER, integerNDIV, logicalIEEE, integerTTYPE, realDMIN1, realDMIN2, realDN, realDN1, realDN2, realG, realTAU)¶
SLASQ3 Purpose:SLASQ3 checks for deflation, computes a shift (TAU) and calls dqds. In case of failure it changes shifts, and tries again until output is positive.
I0
N0
Z
PP
DMIN
SIGMA
DESIG
QMAX
NFAIL
ITER
NDIV
IEEE
TTYPE
DMIN1
DMIN2
DN
DN1
DN2
G
TAU
Author:
I0 is INTEGER First index.
N0 is INTEGER Last index.
Z is REAL array, dimension ( 4*N ) Z holds the qd array.
PP is INTEGER PP=0 for ping, PP=1 for pong. PP=2 indicates that flipping was applied to the Z array and that the initial tests for deflation should not be performed.
DMIN is REAL Minimum value of d.
SIGMA is REAL Sum of shifts used in current segment.
DESIG is REAL Lower order part of SIGMA
QMAX is REAL Maximum value of q.
NFAIL is INTEGER Number of times shift was too big.
ITER is INTEGER Number of iterations.
NDIV is INTEGER Number of divisions.
IEEE is LOGICAL Flag for IEEE or non IEEE arithmetic (passed to SLASQ5).
TTYPE is INTEGER Shift type.
DMIN1 is REAL
DMIN2 is REAL
DN is REAL
DN1 is REAL
DN2 is REAL
G is REAL
TAU is REAL These are passed as arguments in order to save their values between calls to SLASQ3.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
April 2012
Author¶
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