function vanderpol_ode_test ( )

%*****************************************************************************80
%
%% vanderpol_ode_test() solves vanderpol_ode().
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    26 April 2021
%
%  Author:
%
%    John Burkardt
%
  addpath ( '../vanderpol_ode' );

  timestamp ( );
  fprintf ( 1, '\n' );
  fprintf ( 1, 'vanderpol_ode_test():\n' );
  fprintf ( 1, '  MATLAB/Octave version %s\n', version ( ) );
  fprintf ( 1, '  Solve the van der Pol oscillator ODE.\n' );
%
%  Get parameter values.
%
  [ mu, t0, y0, tstop ] = vanderpol_parameters ( );

  mu = 15.0;
  tstop = 100.0;
%
%  Reset parameter values.
%
  vanderpol_parameters ( mu, t0, y0, tstop );
  fprintf ( 1, '\n' );
  fprintf ( 1, '  parameters:\n' );
  fprintf ( 1, '    mu    = %g\n', mu );
  fprintf ( 1, '    t0    = %g\n', t0 );
  fprintf ( 1, '    y0    = (%g,%g)\n', y0 );
  fprintf ( 1, '    tstop = %g\n', tstop );

  vanderpol_ode45 ( );

  n = 2000;
  vanderpol_midpoint ( n );
%
%  Terminate.
%
  fprintf ( 1, '\n' );
  fprintf ( 1, 'vanderpol_ode_test():\n' );
  fprintf ( 1, '  Normal end of execution.\n' );

  timestamp ( );

  rmpath ( '../vanderpol_ode' );

  return
end
function timestamp ( )

%*****************************************************************************80
%
%% timestamp() prints the current YMDHMS date as a timestamp.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    14 February 2003
%
%  Author:
%
%    John Burkardt
%
  t = now;
  c = datevec ( t );
  s = datestr ( c, 0 );
  fprintf ( 1, '%s\n', s );

  return
end


