function cdf = lorentz_cdf ( x )

%*****************************************************************************80
%
%% lorentz_cdf() evaluates the Lorentz CDF.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    01 February 1999
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    real X, the argument of the CDF.
%
%  Output:
%
%    real CDF, the value of the CDF.
%
  cdf = 0.5 + atan ( x ) / pi;

  return
end
