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RedHat 9 (Linux i386) - man page for dlasq3 (redhat section l)

DLASQ3(l)						  )						    DLASQ3(l)

NAME
DLASQ3 - check for deflation, computes a shift (TAU) and calls dqds
SYNOPSIS
SUBROUTINE DLASQ3( I0, N0, Z, PP, DMIN, SIGMA, DESIG, QMAX, NFAIL, ITER, NDIV, IEEE ) LOGICAL IEEE INTEGER I0, ITER, N0, NDIV, NFAIL, PP DOUBLE PRECISION DESIG, DMIN, QMAX, SIGMA DOUBLE PRECISION Z( * )
PURPOSE
DLASQ3 checks for deflation, computes a shift (TAU) and calls dqds. In case of failure it changes shifts, and tries again until output is positive.
ARGUMENTS
I0 (input) INTEGER First index. N0 (input) INTEGER Last index. Z (input) DOUBLE PRECISION array, dimension ( 4*N ) Z holds the qd array. PP (input) INTEGER PP=0 for ping, PP=1 for pong. 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. TTYPE (output) INTEGER Shift type. IEEE (input) LOGICAL Flag for IEEE or non IEEE arithmetic (passed to DLASQ5). LAPACK version 3.0 15 June 2000 DLASQ3(l)


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