写分时强势的时间大于200分钟

 网友求助：

请老师帮写分时强势的信号出现后保持大于200分钟不消失的选股公式。
A1:=(VOL/CLOSE)/3;
A2:=SUM((IF(((A1>0.29) AND (CLOSE>(REF(CLOSE,1)))),A1,0)),0);
A3:=SUM((IF(((A1>0.29) AND (CLOSE<(REF(CLOSE,1)))),A1,0)),0);
DIF:=(EMA(CLOSE,380)-EMA(CLOSE,800))*50;
DEA:=EMA(DIF,40);
MACD:=(DIF-DEA)*5;
DIF>=DEA and MACD>0 and A2>A3;
 

解答如下：

A1:=(VOL/CLOSE)/3;
A2:=SUM((IF(((A1>0.29) AND (CLOSE>(REF(CLOSE,1)))),A1,0)),0);
A3:=SUM((IF(((A1>0.29) AND (CLOSE<(REF(CLOSE,1)))),A1,0)),0);
DIF:=(EMA(CLOSE,380)-EMA(CLOSE,800))*50;
DEA:=EMA(DIF,40);
MACD:=(DIF-DEA)*5;
AA:=DIF>=DEA and MACD>0 and A2>A3;
LAST(AA)>=200; {分析周期：分时}