function [ n_data, a, b, x, fx ] = von_mises_cdf_values ( n_data )

%*****************************************************************************80
%
%% von_mises_cdf_values() returns some values of the von Mises CDF.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    08 December 2004
%
%  Author:
%
%    John Burkardt
%
%  Reference:
%
%    Kanti Mardia, Peter Jupp,
%    Directional Statistics,
%    Wiley, 2000, QA276.M335
%
%  Input:
%
%    integer N_DATA.  The user sets N_DATA to 0 before the first 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 A, B, the parameters of the function.
%
%    real X, the argument of the function.
%
%    real FX, the value of the function.
%
  n_max = 23;

  a_vec = [ ...
     0.0E+00, ...
     0.0E+00, ...
     0.0E+00, ...
     0.0E+00, ...
     0.0E+00, ...
     0.1E+01, ...
     0.1E+01, ...
     0.1E+01, ...
     0.1E+01, ...
     0.1E+01, ...
     0.1E+01, ...
    -0.2E+01, ...
    -0.1E+01, ...
     0.0E+01, ...
     0.1E+01, ...
     0.2E+01, ...
     0.3E+01, ...
     0.0E+00, ...
     0.0E+00, ...
     0.0E+00, ...
     0.0E+00, ...
     0.0E+00, ...
     0.0E+00 ];

  b_vec = [ ...
     0.1E+01, ...
     0.1E+01, ...
     0.1E+01, ...
     0.1E+01, ...
     0.1E+01, ...
     0.2E+01, ...
     0.2E+01, ...
     0.2E+01, ...
     0.2E+01, ...
     0.2E+01, ...
     0.2E+01, ...
     0.3E+01, ...
     0.3E+01, ...
     0.3E+01, ...
     0.3E+01, ...
     0.3E+01, ...
     0.3E+01, ...
     0.0E+00, ...
     0.1E+01, ...
     0.2E+01, ...
     0.3E+01, ...
     0.4E+01, ...
     0.5E+01 ];

  fx_vec = [ ......
    0.2535089956281180E-01, ...
    0.1097539041177346E+00, ...
    0.5000000000000000E+00, ...
    0.8043381312498558E+00, ...
    0.9417460124555197E+00, ...
    0.5000000000000000E+00, ...
    0.6018204118446155E+00, ...
    0.6959356933122230E+00, ...
    0.7765935901304593E+00, ...
    0.8410725934916615E+00, ...
    0.8895777369550366E+00, ...
    0.9960322705517925E+00, ...
    0.9404336090170247E+00, ...
    0.5000000000000000E+00, ...
    0.5956639098297530E-01, ...
    0.3967729448207649E-02, ...
    0.2321953958111930E-03, ...
    0.6250000000000000E+00, ...
    0.7438406999109122E+00, ...
    0.8369224904294019E+00, ...
    0.8941711407897124E+00, ...
    0.9291058600568743E+00, ...
    0.9514289900655436E+00 ];

  x_vec = [ ......
    -0.2617993977991494E+01, ...
    -0.1570796326794897E+01, ...
     0.0000000000000000E+00, ...
     0.1047197551196598E+01, ...
     0.2094395102393195E+01, ...
     0.1000000000000000E+01, ...
     0.1200000000000000E+01, ...
     0.1400000000000000E+01, ...
     0.1600000000000000E+01, ...
     0.1800000000000000E+01, ...
     0.2000000000000000E+01, ...
     0.0000000000000000E+00, ...
     0.0000000000000000E+00, ...
     0.0000000000000000E+00, ...
     0.0000000000000000E+00, ...
     0.0000000000000000E+00, ...
     0.0000000000000000E+00, ...
     0.7853981633974483E+00, ...
     0.7853981633974483E+00, ...
     0.7853981633974483E+00, ...
     0.7853981633974483E+00, ...
     0.7853981633974483E+00, ...
     0.7853981633974483E+00 ];

  if ( n_data < 0 )
    n_data = 0;
  end

  n_data = n_data + 1;

  if ( n_max < n_data )
    n_data = 0;
    a = 0.0;
    b = 0.0;
    x = 0.0;
    fx = 0.0;
  else
    a = a_vec(n_data);
    b = b_vec(n_data);
    x = x_vec(n_data);
    fx = fx_vec(n_data);
  end

  return
end
