function [ n_data, x, fx ] = i0ml0_values ( n_data )

%*****************************************************************************80
%
%% I0ML0_VALUES returns some values of the I0ML0 function.
%
%  Discussion:
%
%    The function is defined by:
%
%      I0ML0(x) = I0(x) - L0(x)
%
%    I0(x) is the modified Bessel function of the first kind of order 0,
%    L0(x) is the modified Struve function of order 0.
%
%    The data was reported by McLeod.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    16 September 2004
%
%  Author:
%
%    John Burkardt
%
%  Reference:
%
%    Allan McLeod,
%    Algorithm 757, MISCFUN: A software package to compute uncommon
%      special functions,
%    ACM Transactions on Mathematical Software,
%    Volume 22, Number 3, September 1996, pages 288-301.
%
%  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 = 20;

  fx_vec = [ ...
     0.99875755515461749793E+00, ...
     0.99011358230706643807E+00, ...
     0.92419435310023947018E+00, ...
     0.73624267134714273902E+00, ...
     0.55582269181411744686E+00, ...
     0.34215154434462160628E+00, ...
     0.17087174888774706539E+00, ...
     0.81081008709219208918E-01, ...
     0.53449421441089580702E-01, ...
     0.39950321008923244846E-01, ...
     0.39330637437584921392E-01, ...
     0.37582274342808670750E-01, ...
     0.31912486554480390343E-01, ...
     0.25506146883504738403E-01, ...
     0.21244480317825292412E-01, ...
     0.15925498348551684335E-01, ...
     0.12737506927242585015E-01, ...
     0.84897750814784916847E-02, ...
     0.63668349178454469153E-02, ...
     0.50932843163122551114E-02 ];

  x_vec = [ ...
       0.0019531250E+00, ...
       0.0156250000E+00, ...
       0.1250000000E+00, ...
       0.5000000000E+00, ...
       1.0000000000E+00, ...
       2.0000000000E+00, ...
       4.0000000000E+00, ...
       8.0000000000E+00, ...
      12.0000000000E+00, ...
      16.0000000000E+00, ...
      16.2500000000E+00, ...
      17.0000000000E+00, ...
      20.0000000000E+00, ...
      25.0000000000E+00, ...
      30.0000000000E+00, ...
      40.0000000000E+00, ...
      50.0000000000E+00, ...
      75.0000000000E+00, ...
     100.0000000000E+00, ...
     125.0000000000E+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
