function value = f_01 ( x )

%*****************************************************************************80
%
%% f_01() evaluates sin ( x ) - x / 2.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    13 April 2008
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    real X, the point at which F is to be evaluated.
%
%  Output:
%
%    real VALUE, the value of the function at X.
%
  value = sin ( x ) - 0.5 * x;

  return
end
