function rk2_implicit_test ( )

%*****************************************************************************80
%
%% rk2_implicit_test() tests rk2_implicit().
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    10 November 2024
%
%  Author:
%
%    John Burkardt
%
  addpath ( '../rk2_implicit' );

  timestamp ( );
  fprintf ( 1, '\n' );
  fprintf ( 1, 'rk2_implicit_test():\n' );
  fprintf ( 1, '  MATLAB/Octave version %s\n', version ( ) );
  fprintf ( 1, '  Test rk2_implicit() on several ODE''s.\n' );
  fprintf ( 1, '  We use a constant stepsize.\n' );

  tspan = [ 0.0, 2.0 ];
  y0 = humps_exact ( tspan(1) );
  n = 50;
  humps_rk2_implicit_test ( tspan, y0, n );

  tspan = [ 0.0, 5.0 ];
  y0 = [ 5000, 100 ];
  n = 200;
  predator_prey_rk2_implicit_test ( tspan, y0, n );

  tspan = [ 0.0, 1.0 ];
  y0 = 0.0;
  n = 27;
  stiff_rk2_implicit_test ( tspan, y0, n );
%
%  Terminate.
%
  fprintf ( 1, '\n' );
  fprintf ( 1, 'rk2_implicit_test():\n' );
  fprintf ( 1, '  Normal end of execution.\n' );
  fprintf ( 1, '\n' );
  timestamp ( );

  rmpath ( '../rk2_implicit' )

  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

