DLASQ3 - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)
NAMEDLASQ3 - checks for deflation, computes a shift (TAU) and calls dqds
SYNOPSISSUBROUTINE DLASQ3(  I0, N0, Z, PP, DMIN, SIGMA, DESIG, QMAX, NFAIL, ITER, NDIV, IEEE, TTYPE, DMIN1, DMIN2, DN, DN1, DN2, G, TAU )  LOGICAL IEEE  INTEGER I0, ITER, N0, NDIV, NFAIL, PP  DOUBLE PRECISION DESIG, DMIN, DMIN1, DMIN2, DN, DN1, DN2, G, QMAX, SIGMA, TAU  DOUBLE PRECISION Z( * )
PURPOSEDLASQ3 checks for deflation, computes a shift (TAU) and calls dqds. In case of failure it changes shifts, and tries again until output is positive.
ARGUMENTSI0 (input) INTEGER  First index. N0 (input) INTEGER  Last index. Z (input) DOUBLE PRECISION array, dimension ( 4*N )  Z holds the qd array. PP (input/output) 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 (output) DOUBLE PRECISION  Minimum value of d. SIGMA (output) DOUBLE PRECISION  Sum of shifts used in current segment. DESIG (input/output) DOUBLE PRECISION  Lower order part of SIGMA QMAX (input) DOUBLE PRECISION  Maximum value of q. NFAIL (output) INTEGER  Number of times shift was too big. ITER (output) INTEGER  Number of iterations. NDIV (output) INTEGER  Number of divisions. IEEE (input) LOGICAL  Flag for IEEE or non IEEE arithmetic (passed to DLASQ5). TTYPE (input/output) INTEGER  Shift type. DMIN1, DMIN2, DN, DN1, DN2, G, TAU (input/output) DOUBLE PRECISION These are passed as arguments in order to save their values between calls to DLASQ3. 0
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