%LT Dataset overload

function c = lt(a,b)
		if (isa(a,'prdataset')) && (~isa(b,'prdataset'))
		c = a;
		d = (a.data < b);
	elseif (~isa(a,'prdataset')) && (isa(b,'prdataset'))
		c = b;
		d = a < b.data;
	else
		c = a;
		d = a.data < b.data;
	end
	c = setdata(c,d);
return;
