redhat man page for dlasq4

DLASQ4(l)								 )								 DLASQ4(l)

NAME
       DLASQ4 - compute an approximation TAU to the smallest eigenvalue using values of d from the previous transform

SYNOPSIS
       SUBROUTINE DLASQ4( I0, N0, Z, PP, N0IN, DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU, TTYPE )

	   INTEGER	  I0, N0, N0IN, PP, TTYPE

	   DOUBLE	  PRECISION DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU

	   DOUBLE	  PRECISION Z( * )

PURPOSE
       DLASQ4 computes an approximation TAU to the smallest eigenvalue using values of d from the previous transform.  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.

       NOIN  (input) INTEGER
	     The value of N0 at start of EIGTEST.

       DMIN  (input) DOUBLE PRECISION
	     Minimum value of d.

       DMIN1 (input) DOUBLE PRECISION
	     Minimum value of d, excluding D( N0 ).

       DMIN2 (input) DOUBLE PRECISION
	     Minimum value of d, excluding D( N0 ) and D( N0-1 ).

       DN    (input) DOUBLE PRECISION
	     d(N)

       DN1   (input) DOUBLE PRECISION
	     d(N-1)

       DN2   (input) DOUBLE PRECISION
	     d(N-2)

       TAU   (output) DOUBLE PRECISION
	     This is the shift.

       TTYPE (output) INTEGER
	     Shift type.

FURTHER DETAILS
LAPACK version 3.0						   15 June 2000 							 DLASQ4(l)