macd零轴上死叉的选股公式

编写要求：

macd零轴上死叉的选股公式。

www.gszx.com.cn网解答：

DIFF:=EMA(CLOSE,12)-EMA(CLOSE,26);
DEA:=EMA(DIFF,9);
CROSS(DEA,DIFF)and DEA>0;