function value = antisummation_condition ( n )

%*****************************************************************************80
%
%% antisummation_condition() returns the L1 condition of the ANTISUMMATION matrix.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    14 October 2022
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    integer N, the order of the matrix.
%
%  Output:
%
%    real VALUE, the L1 condition number.
%
  norm_A = n;

  norm_inv = 1.0;
  twoi = 1.0;
  for i = 0 : n - 2
    norm_inv = norm_inv + twoi;
    twoi = twoi * 2.0;
  end

  value = norm_A * norm_inv;

  return
end
