编收盘站上七日线后k线要碰到布林线中轨

input:N(0.1,0.01,10), M(2,1,10);{自己调节N值，守窄程度}
MA7:=EMA(CLOSE,7);
MID:=MA(CLOSE,20);
UPPER:=MID+2*STD(CLOSE,20);
LOWER:=MID-2*STD(CLOSE,20);
A1:=MAX(LOWER,UPPER);
A2:=MIN(LOWER,UPPER);
NH:=COUNT(ABS(A1-A2)/A2<N,M)=M;
UPER2:=UPPER>REF(UPPER,1) AND REF(UPPER,1)<REF(UPPER,2);
LOWER2:=LOWER>REF(LOWER,1);
XG:cross(c,MID) and NH and UPER2 AND LOWER2;

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