function [ n_data, x, fx ] = bessel_j1_spherical_values ( n_data )

%*****************************************************************************80
%
%% BESSEL_J1_SPHERICAL_VALUES returns some values of the Spherical Bessel function j1.
%
%  Discussion:
%
%    In Mathematica, the function can be evaluated by:
%
%      Sqrt[Pi/(2*x)] * BesselJ[3/2,x]
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    23 August 2004
%
%  Author:
%
%    John Burkardt
%
%  Reference:
%
%    Milton Abramowitz and Irene Stegun,
%    Handbook of Mathematical Functions,
%    US Department of Commerce, 1964.
%
%    Stephen Wolfram,
%    The Mathematica Book,
%    Fourth Edition,
%    Wolfram Media / Cambridge University Press, 1999.
%
%  Parameters:
%
%    Input/output, integer N_DATA.  The user sets N_DATA to 0 before the
%    first call.  On each call, the routine increments N_DATA by 1, and
%    returns the corresponding data; when there is no more data, the
%    output value of N_DATA will be 0 again.
%
%    Output, real X, the argument of the function.
%
%    Output, real FX, the value of the function.
%
  n_max = 21;

  fx_vec = [ ...
     0.3330001190255757E-01, ...
     0.6640038067032223E-01, ...
     0.1312121544218529E+00, ...
     0.1928919568034122E+00, ...
     0.2499855053465475E+00, ...
     0.3011686789397568E+00, ...
     0.3452845698577903E+00, ...
     0.3813753724123076E+00, ...
     0.4087081401263934E+00, ...
     0.4267936423844913E+00, ...
     0.4353977749799916E+00, ...
     0.4345452193763121E+00, ...
     0.4245152947656493E+00, ...
     0.4058301968314685E+00, ...
     0.3792360591872637E+00, ...
     0.3456774997623560E+00, ...
     0.3062665174917607E+00, ...
     0.2622467779189737E+00, ...
     0.2149544641595738E+00, ...
     0.1657769677515280E+00, ...
     0.1161107492591575E+00  ];

  x_vec = [ ...
     0.1E+00, ...
     0.2E+00, ...
     0.4E+00, ...
     0.6E+00, ...
     0.8E+00, ...
     1.0E+00, ...
     1.2E+00, ...
     1.4E+00, ...
     1.6E+00, ...
     1.8E+00, ...
     2.0E+00, ...
     2.2E+00, ...
     2.4E+00, ...
     2.6E+00, ...
     2.8E+00, ...
     3.0E+00, ...
     3.2E+00, ...
     3.4E+00, ...
     3.6E+00, ...
     3.8E+00, ...
     4.0E+00 ];

  if ( n_data < 0 )
    n_data = 0;
  end

  n_data = n_data + 1;

  if ( n_max < n_data )
    n_data = 0;
    x = 0.0;
    fx = 0.0;
  else
    x = x_vec(n_data);
    fx = fx_vec(n_data);
  end

  return
end
