redhat man page for slasq3

SLASQ3(l)								 )								 SLASQ3(l)

NAME
       SLASQ3 - check for deflation, computes a shift (TAU) and calls dqds

SYNOPSIS
       SUBROUTINE SLASQ3( I0, N0, Z, PP, DMIN, SIGMA, DESIG, QMAX, NFAIL, ITER, NDIV, IEEE )

	   LOGICAL	  IEEE

	   INTEGER	  I0, ITER, N0, NDIV, NFAIL, PP

	   REAL 	  DESIG, DMIN, QMAX, SIGMA

	   REAL 	  Z( * )

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.

ARGUMENTS
       I0     (input) INTEGER
	      First index.

       N0     (input) INTEGER
	      Last index.

       Z      (input) REAL array, dimension ( 4*N )
	      Z holds the qd array.

       PP     (input) INTEGER
	      PP=0 for ping, PP=1 for pong.

       DMIN   (output) REAL
	      Minimum value of d.

       SIGMA  (output) REAL
	      Sum of shifts used in current segment.

       DESIG  (input/output) REAL
	      Lower order part of SIGMA

       QMAX   (input) REAL
	      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 SLASQ5).

LAPACK version 3.0						   15 June 2000 							 SLASQ3(l)