通达信BOLL中轨选股指标(源码)

N:=5;
BOLL:=MA(CLOSE,N);
UB:=BOLL+2*STD(CLOSE,N);
LB:=BOLL-2*STD(CLOSE,N);
BOLL>=REF(BOLL,1) AND C>=BOLL AND L<=BOLL;