function value = runge_antideriv ( x )

%*****************************************************************************80
%
%% runge_antideriv() evaluates the antiderivative of the Runge function.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    24 March 2025
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    real x: the argument of the function.
%
%  Output:
%
%    real value: the value of the antiderivative.
%
  value = atan ( 5.0 * x ) / 5.0;

  return
end
