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dlasq6 examples
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Man Page Details
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NAME
       DLASQ6  -  one  dqd  (shift equal to zero) transform in ping-pong form,
       with protection against underflow and overflow

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

           INTEGER        I0, N0, PP

           DOUBLE         PRECISION DMIN, DMIN1, DMIN2, DN, DNM1, DNM2

           DOUBLE         PRECISION Z( * )

  Purpose
  =======

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

  Arguments
  =========

  I0    (input) INTEGER
        First index.

  N0    (input) INTEGER
        Last index.

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

  DMIN  (output) DOUBLE PRECISION
        Minimum value of d.

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

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

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

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

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

