nag_sum_chebyshev (c06dcc) Example Program Data
   4                      : n,   length of series
   3                      : lx,  number of evaluation points
   0.5  1.0  -0.2         : x[], evaluation points
  -1.0  1.0               : xmin xmax, range for x
Nag_SeriesGeneral         : s,   form of series
   1.0  1.0   0.5  0.25   : c[], the series coefficients