布林线选股指标

MA7:EMA(CLOSE,7),COLORFFFFFF;
MID:MA(CLOSE,20),COLORYELLOW;
UPPER:MID+2*STD(CLOSE,20),COLORRED,DOTLINE;
LOWER:MID-2*STD(CLOSE,20),COLORGREEN,DOTLINE;

当中轨平行或上行时，7日线上穿中轨 做个选股公式，谢谢老师

 

ma(c,20)>=ref(ma(c,20),2) and cross(ema(c,7),ma(c,20));