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

%*****************************************************************************80
%
%% airy_bi_int_values() returns some values of the integral of the Airy function.
%
%  Discussion:
%
%    The function is defined by:
%
%      AIRY_BI_INT(x) = Integral ( 0 <= t <= x ) Bi(t) dt
%
%    The data was reported by McLeod.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    15 September 2004
%
%  Author:
%
%    John Burkardt
%
%  Reference:
%
%    Milton Abramowitz and Irene Stegun,
%    Handbook of Mathematical Functions,
%    US Department of Commerce, 1964.
%
%    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.
%
%  Input:
%
%    integer N_DATA.  The user sets N_DATA to 0 before the first call.  
%    Thereafter, it should simply be the value returned by the previous call.
%
%  Output:
%
%    integer N_DATA.  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.
%
%    real X, the argument of the function.
%
%    real FX, the value of the function.
%
  n_max = 20;

  fx_vec = [ ...
      0.17660819031554631869E-01, ...
     -0.15040424806140020451E-01, ...
      0.14756446293227661920E-01, ...
     -0.11847304264848446271E+00, ...
     -0.64916741266165856037E-01, ...
      0.97260832464381044540E-01, ...
      0.50760058495287539119E-01, ...
     -0.37300500963429492179E+00, ...
     -0.13962988442666578531E+00, ...
     -0.12001735266723296160E-02, ...
      0.12018836117890354598E-02, ...
      0.36533846550952011043E+00, ...
      0.87276911673800812196E+00, ...
      0.48219475263803429675E+02, ...
      0.44006525804904178439E+06, ...
      0.17608153976228301458E+07, ...
      0.73779211705220007228E+07, ...
      0.14780980310740671617E+09, ...
      0.97037614223613433849E+11, ...
      0.11632737638809878460E+15 ];

  x_vec = [ ...
     -12.0000000000E+00, ...
     -10.0000000000E+00, ...
      -8.0000000000E+00, ...
      -7.5000000000E+00, ...
      -7.0000000000E+00, ...
      -6.5000000000E+00, ...
      -4.0000000000E+00, ...
      -1.0000000000E+00, ...
      -0.2500000000E+00, ...
      -0.0019531250E+00, ...
       0.0019531250E+00, ...
       0.5000000000E+00, ...
       1.0000000000E+00, ...
       4.0000000000E+00, ...
       8.0000000000E+00, ...
       8.5000000000E+00, ...
       9.0000000000E+00, ...
      10.0000000000E+00, ...
      12.0000000000E+00, ...
      14.0000000000E+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
