为什么这个选股公式没有未来函数，但指标会漂移呢，如何修改呢?

AAA2:=SUM(IF( CLOSE>REF(CLOSE,1),VOL*C,0),0);

AAA3:=SUM(IF( CLOSE<REF(CLOSE,1),VOL*C,0),0);

AAA4:=SUM(IF( CLOSE=REF(CLOSE,1),VOL*C,0),0);

MAC5:=(ATAN((MA(C,5)/REF(MA(C,5),1)-1)*100)*180/3.1415926);

MM5:=MA(MAC5,5);

AMA:=PLOYLINE(CROSS(MAC5,MM5),MM5);

AAB:=PLOYLINE(CROSS(MM5,MAC5),MAC5);

买入涨:=COUNT(CROSS(MAC5,MM5),AMA<REF(AMA,5) AND AAB>REF(AAB,5));

DRAWICON(买入涨,L*0.985,9);