function [ a, b] = p13_interval ( )

%*****************************************************************************80
%
%% p13_interval() returns a starting interval for optimization for problem 13.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    04 August 2019
%
%  Author:
%
%    John Burkardt
%
%  Output:
%
%    real a, b, two points defining an interval in which
%    the local minimizer should be sought.
%
  a = -2.0;
  b = +2.0;

  return
end
