SLASQ4  -  compute  an  approximation  TAU to the smallest
       eigenvalue using values of d from the previous transform


SYNOPSIS

       SUBROUTINE SLASQ4( I0,  N0,  Z,  PP,  N0IN,  DMIN,  DMIN1,
                          DMIN2, DN, DN1, DN2, TAU, TTYPE )

           INTEGER        I0, N0, N0IN, PP, TTYPE

           REAL           DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU

           REAL           Z( * )


PURPOSE

       SLASQ4  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) REAL 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) REAL
             Minimum value of d.

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

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

       DN    (input) REAL
             d(N)

       DN1   (input) REAL
             d(N-1)

       DN2   (input) REAL
             d(N-2)

       TAU   (output) REAL
             This is the shift.

       TTYPE (output) INTEGER



FURTHER DETAILS



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