function r8_atanh_test ( )

%*****************************************************************************80
%
%% r8_atanh_test() tests r8_atanh().
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    22 April 2016
%
%  Author:
%
%    John Burkardt
%
  addpath ( '../test_values' );

  fprintf ( 1, '\n' );
  fprintf ( 1, 'r8_atanh_test():\n' );
  fprintf ( 1, '  r8_atanh() evaluates the hyperbolic arctangent function.\n' );
  fprintf ( 1, '\n' );
  fprintf ( 1, '             X     ARCTANH(X)  R8_ATANH(X)         Diff\n' );
  fprintf ( 1, '\n' );

  n_data = 0;

  while ( true )

    [ n_data, x, fx1 ] = arctanh_values ( n_data );

    if ( n_data == 0 )
      break
    end

    fx2 = r8_atanh ( x );

    fprintf ( 1, '  %14f  %14g  %14g  %14g\n', x, fx1, fx2, abs ( fx1 - fx2 ) );

  end

  rmpath ( '../test_values' );

  return
end
