NAME

       dlasq6.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dlasq6 (I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2)
           DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

Function/Subroutine Documentation

   subroutine dlasq6 (integer I0, integer N0, double precision, dimension( * ) Z, integer PP,
       double precision DMIN, double precision DMIN1, double precision DMIN2, double precision
       DN, double precision DNM1, double precision DNM2)
       DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

       Purpose:

            DLASQ6 computes one dqd (shift equal to zero) transform in
            ping-pong form, with protection against underflow and overflow.

       Parameters:
           I0

                     I0 is INTEGER
                   First index.

           N0

                     N0 is INTEGER
                   Last index.

           Z

                     Z is DOUBLE PRECISION array, dimension ( 4*N )
                   Z holds the qd array. EMIN is stored in Z(4*N0) to avoid
                   an extra argument.

           PP

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

           DMIN

                     DMIN is DOUBLE PRECISION
                   Minimum value of d.

           DMIN1

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

           DMIN2

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

           DN

                     DN is DOUBLE PRECISION
                   d(N0), the last value of d.

           DNM1

                     DNM1 is DOUBLE PRECISION
                   d(N0-1).

           DNM2

                     DNM2 is DOUBLE PRECISION
                   d(N0-2).

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           September 2012

Author

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