SRC/slasq4.f(3)            Library Functions Manual            SRC/slasq4.f(3)

NAME
       SRC/slasq4.f

SYNOPSIS
   Functions/Subroutines
       subroutine slasq4 (i0, n0, z, pp, n0in, dmin, dmin1, dmin2, dn, dn1,
           dn2, tau, ttype, g)
           SLASQ4 computes an approximation to the smallest eigenvalue using
           values of d from the previous transform. Used by sbdsqr.

Function/Subroutine Documentation
   subroutine slasq4 (integer i0, integer n0, real, dimension( * ) z, integer
       pp, integer n0in, real dmin, real dmin1, real dmin2, real dn, real dn1,
       real dn2, real tau, integer ttype, real g)
       SLASQ4 computes an approximation to the smallest eigenvalue using
       values of d from the previous transform. Used by sbdsqr.

       Purpose:


            SLASQ4 computes an approximation TAU to the smallest eigenvalue
            using values of d from the previous transform.

       Parameters
           I0

                     I0 is INTEGER
                   First index.

           N0

                     N0 is INTEGER
                   Last index.

           Z

                     Z is REAL array, dimension ( 4*N0 )
                   Z holds the qd array.

           PP

                     PP is INTEGER
                   PP=0 for ping, PP=1 for pong.

           N0IN

                     N0IN is INTEGER
                   The value of N0 at start of EIGTEST.

           DMIN

                     DMIN is REAL
                   Minimum value of d.

           DMIN1

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

           DMIN2

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

           DN

                     DN is REAL
                   d(N)

           DN1

                     DN1 is REAL
                   d(N-1)

           DN2

                     DN2 is REAL
                   d(N-2)

           TAU

                     TAU is REAL
                   This is the shift.

           TTYPE

                     TTYPE is INTEGER
                   Shift type.

           G

                     G is REAL
                   G is passed as an argument in order to save its value between
                   calls to SLASQ4.

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Further Details:


             CNST1 = 9/16

       Definition at line 149 of file slasq4.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/slasq4.f(3)