nag_ddot (f16eac) Example Program Data
   5                                       : first dot product, n
   1    -1                                 : incx and incy
   0.3                                     : alpha
   1.0   2.0   3.0   4.0   5.0             : x[]
   1.0   2.0   3.0  -4.0  -5.0             : y[]

   4                                       : second dot product, n
  -2    -1                                 : incx and incy
  -7.0                                     : alpha
   0.1   9.9   0.2   9.9   0.3   9.9  0.4  : x[]
   0.1   0.2   0.3   0.4                   : y[]