function [ n_data, x, fx ] = abram2_values ( n_data )

%*****************************************************************************80
%
%% ABRAM2_VALUES returns some values of the Abramowitz2 function.
%
%  Discussion:
%
%    The function is defined by:
%
%      ABRAM2(x) = Integral ( 0 <= t < infinity ) t^2 * exp( -t^2 - x / t ) dt
% 
%    The data was reported by McLeod.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL 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.
%
%  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 = [ ...
     0.44213858162107913430E+00, ...
     0.43923379545684026308E+00, ...
     0.42789857297092602234E+00, ...
     0.38652825661854504406E+00, ...
     0.26538204413231368110E+00, ...
     0.16848734838334595000E+00, ...
     0.13609200032513227112E+00, ...
     0.11070330027727917352E+00, ...
     0.82126019995530382267E-01, ...
     0.74538781999594581763E-01, ...
     0.67732034377612811390E-01, ...
     0.35641808698811851022E-01, ...
     0.17956589956618269083E-01, ...
     0.94058737143575370625E-02, ...
     0.50809356204299213556E-02, ...
     0.28149565414209719359E-02, ...
     0.53808696422559303431E-03, ...
     0.44821756380146327259E-04, ...
     0.46890678427324100410E-05, ...
     0.20161544850996420504E-08 ];

  x_vec = [ ...
     0.0019531250E+00, ...
     0.0078125000E+00, ...
     0.0312500000E+00, ...
     0.1250000000E+00, ...
     0.5000000000E+00, ...
     1.0000000000E+00, ...
     1.2500000000E+00, ...
     1.5000000000E+00, ...
     1.8750000000E+00, ...
     2.0000000000E+00, ...
     2.1250000000E+00, ...
     3.0000000000E+00, ...
     4.0000000000E+00, ...
     5.0000000000E+00, ...
     6.0000000000E+00, ...
     7.0000000000E+00, ...
     10.0000000000E+00, ...
     15.0000000000E+00, ...
     20.0000000000E+00, ...
     40.0000000000E+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
