请老师编一个MACD在0轴上死叉以后出现绿柱比昨天短，谢谢
体选股条件是：MACD首先必须是在0轴上出现死叉（就是0轴上DIFF下叉DEA并向下）以后，在MACD由红柱翻绿后，当MACD绿柱比昨天绿柱短且DIFF和DEA指标同时在0轴上的选股公式，上个图说明
解答：
aa:="macd.diff";
bb:="macd.dea";
dd:="macd.macd";
t:=BARSLAST(aa>bb);
cross(count(dd>ref(dd,1) and dd<0,t),0.5);
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