DLASQ6(3)      LAPACK routine of NEC Numeric Library Collection      DLASQ6(3)



NAME
       DLASQ6

SYNOPSIS
       SUBROUTINE DLASQ6 (I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2)



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




ARGUMENTS
           I0        (input)
                     I0 is INTEGER
                   First index.

           N0        (input)
                     N0 is INTEGER
                   Last index.

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

           DMIN      (output)
                     DMIN is DOUBLE PRECISION
                   Minimum value of d.

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

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

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

           DNM1      (output)
                     DNM1 is DOUBLE PRECISION
                   d(N0-1).

           DNM2      (output)
                     DNM2 is DOUBLE PRECISION
                   d(N0-2).



LAPACK routine                  31 October 2017                      DLASQ6(3)