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

%*****************************************************************************80
%
%% COS_DEGREE_VALUES: the cosine function with argument in degrees.
%
%  Discussion:
%
%    In Mathematica, the function can be evaluated by:
%
%      Cos[x Degree]
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    23 March 2010
%
%  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.
%
%  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 = 22;

  fx_vec = [ ...
     0.99619469809174553230, ...
     1.0000000000000000000, ...
     0.99984769515639123916, ...
     0.99939082701909573001, ...
     0.99862953475457387378, ...
     0.99756405025982424761, ...
     0.99619469809174553230, ...
     0.98480775301220805937, ...
     0.96592582628906828675, ...
     0.86602540378443864676, ...
     0.70710678118654752440, ...
     0.50000000000000000000, ...
     0.25881904510252076235, ...
     0.087155742747658173558, ...
     0.069756473744125300776, ...
     0.052335956242943832722, ...
     0.034899496702500971646, ...
     0.017452406437283512819, ...
     0.000000000000000000000, ...
    -0.017452406437283512819, ...
    -0.25881904510252076235, ...
    -1.0000000000000000000 ];
  x_vec = [ ...
     -5.0, ...
      0.0, ...
      1.0, ...
      2.0, ...
      3.0, ...
      4.0, ...
      5.0, ...
     10.0, ...
     15.0, ...
     30.0, ...
     45.0, ...
     60.0, ...
     75.0, ...
     85.0, ...
     86.0, ...
     87.0, ...
     88.0, ...
     89.0, ...
     90.0, ...
     91.0, ...
    105.0, ...
    180.0 ];

  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
