请老师把通达信布林极限公式，改成选股公式，源码： 要求选出BB刚刚上穿MA，，，谢谢

Question

MID:=MA(C,20);
VART1:=POW((C-MID),2);
VART2:=MA(VART1,20);
VART3:=SQRT(VART2);
UPPER:=MID+2*VART3;
LOWER:=MID-2*VART3;
BOLL:=REF(MID,1);
UB:=REF(UPPER,1);
LB:=REF(LOWER,1);
LOWER1:=MID-VART3;
LB1:=REF(LOWER1,1);
BB:(C-LB1)/(UB-LB)*100;
MA6:MA(BB,6);

Answer 1

MID:=MA(C,20);
VART1:=POW((C-MID),2);
VART2:=MA(VART1,20);
VART3:=SQRT(VART2);
UPPER:=MID+2*VART3;
LOWER:=MID-2*VART3;
BOLL:=REF(MID,1);
UB:=REF(UPPER,1);
LB:=REF(LOWER,1);
LOWER1:=MID-VART3;
LB1:=REF(LOWER1,1);
BB:=(C-LB1)/(UB-LB)*100;
MA6:=MA(BB,6);
XG:CROSS(BB,MA6);

Answer 2

MID:=MA(C,20);
VART1:=POW((C-MID),2);
VART2:=MA(VART1,20);
VART3:=SQRT(VART2);
UPPER:=MID+2*VART3;
LOWER:=MID-2*VART3;
UB:=REF(UPPER,1);
LB:=REF(LOWER,1);
LOWER1:=MID-VART3;
LB1:=REF(LOWER1,1);
BB:=(C-LB1)/(UB-LB)*100;
MA6:=MA(BB,6);
XG:CROSS(BB,MA6);

Answer 3

最后加一行：bb>ma6 and ref(bb<=ma6,1) ;