complement

% -*- texinfo -*-
% @deftypefn {Function File} {} complement (@var{x}, @var{y})
% Return the elements of set @var{y} that are not in set @var{x}.  For
% example,
%
% @example
% @group
% complement ([ 1, 2, 3 ], [ 2, 3, 5 ])
%      @result{} 5
% @end group
% @end example
% @seealso{union, intersect, unique}
% @end deftypefn