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

%*****************************************************************************80
%
%% cosh_values() returns some values of the hyperbolic cosine function.
%
%  Discussion:
%
%    In Mathematica, the function can be evaluated by:
%
%      Cosh[x]
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    23 June 2007
%
%  Author:
%
%    John Burkardt
%
%  Reference:
%
%    Milton Abramowitz, Irene Stegun,
%    Handbook of Mathematical Functions,
%    National Bureau of Standards, 1964,
%    ISBN: 0-486-61272-4,
%    LC: QA47.A34.
%
%    Stephen Wolfram,
%    The Mathematica Book,
%    Fourth Edition,
%    Cambridge University Press, 1999,
%    ISBN: 0-521-64314-7,
%    LC: QA76.95.W65.
%
%  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 = 18;

  fx_vec = [ ...
      74.209948524787844444, ...
       1.5430806348152437785, ...
       1.0000000000000000000, ...
       1.0050041680558035990, ...
       1.0200667556190758463, ...
       1.0453385141288604850, ...
       1.0810723718384548093, ...
       1.1276259652063807852, ...
       1.1854652182422677038, ...
       1.2551690056309430182, ...
       1.3374349463048445980, ...
       1.4330863854487743878, ...
       1.5430806348152437785, ...
       3.7621956910836314596, ...
      10.067661995777765842, ...
      27.308232836016486629, ...
      74.209948524787844444, ...
   11013.232920103323140 ];

  x_vec = [ ...
   -5.0, ...
   -1.0, ...
    0.0, ...
    0.1, ...
    0.2, ...
    0.3, ...
    0.4, ...
    0.5, ...
    0.6, ...
    0.7, ...
    0.8, ...
    0.9, ...
    1.0, ...
    2.0, ...
    3.0, ...
    4.0, ...
    5.0, ...
   10.0 ];

  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

