function a = i4vec_negone ( n )

%*****************************************************************************80
%
%% i4vec_negone() returns an I4VEC of -1's.
%
%  Licensing:
%
%    This code is distributed under the MIT license. 
%
%  Modified:
%
%    26 October 2013
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    integer N, the size of the input array.
%
%  Output:
%
%    integer A(N,1), an array of -1's.
%
  a(1:n,1) = -1;

  return
end
