function [ n_data, x, fx ] = abram1_values ( n_data )

%*****************************************************************************80
%
%% ABRAM1_VALUES returns some values of the Abramowitz1 function.
%
%  Discussion:
%
%    The function is defined by:
%
%      ABRAM1(x) = integral ( 0 <= t < infinity ) t * 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 = [ ...
     0.49828219848799921792E+00, ...
     0.49324391773047288556E+00, ...
     0.47431612784691234649E+00, ...
     0.41095983258760410149E+00, ...
     0.25317617388227035867E+00, ...
     0.14656338138597777543E+00, ...
     0.11421547056018366587E+00, ...
     0.90026307383483764795E-01, ...
     0.64088214170742303375E-01, ...
     0.57446614314166191085E-01, ...
     0.51581624564800730959E-01, ...
     0.25263719555776416016E-01, ...
     0.11930803330196594536E-01, ...
     0.59270542280915272465E-02, ...
     0.30609215358017829567E-02, ...
     0.16307382136979552833E-02, ...
     0.28371851916959455295E-03, ...
     0.21122150121323238154E-04, ...
     0.20344578892601627337E-05, ...
     0.71116517236209642290E-09 ];

  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
