function determ = conex4_determinant ( n )

%*****************************************************************************80
%
%% CONEX4_DETERMINANT returns the determinant of the CONEX4 matrix.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    20 January 2015
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Input, integer N, the order of the matrix.
%
%    Output, real DETERM, the determinant.
%
  determ = - 1.0;

  return
end
