编写要求：
请老师将此指标“买和跟”同显处改为选股公式
谢谢
参数n:5
m:13
MA5:MA(C,N),COLORWHITE;
MA18:=MA(CLOSE,18);
MA13:MA(C,M),COLORGREEN,LINETHICK2;
VAR1:=C=HHV(C,4) AND REF(C,1)=LLV(C,4);
VAR2:=C=LLV(C,4) AND (REF(C,1)=REF(C,2) OR REF(C,2)=LLV(C,4) AND REF(C,1)<=REF(C,3) AND REF(C,2)=REF(C,1);
A:=(3*C+L+O+H)/6;
VAR4:=(20*A+19*REF(A,1)+18*REF(A,2)+17*REF(A,3)+16*REF(A,4)+15*REF(A,5)+
14*REF(A,6)+13*REF(A,7)+12*REF(A,8)+11*REF(A,9)+10*REF(A,10)+9*REF(A,11)+8*REF(A,12)
+7*REF(A,13)+6*REF(A,14)+5*REF(A,15)+4*REF(A,16)+3*REF(A,17)+2*REF(A,18)+REF(A,20))/210;
MTM:=C-REF(C,1);
DX:=100*EMA(EMA(MTM,6),6)/EMA(EMA(ABS(MTM),6),6);
CB:=EMA(VAR4,13);
{红}
STICKLINE(CLOSE>=OPEN,CLOSE,OPEN,3,0),COLOR0000FF;
STICKLINE(CLOSE>=OPEN,CLOSE,OPEN,0.5,0),COLORCC66FF;
{蓝}
STICKLINE(CLOSE50,2) AND CROSS(MA(DX,2),DX);
DRAWTEXT(FILTER(卖=1,1),HIGH*1.02,'冲高卖'),COLORGREEN;
买:=LLV(DX,2)=LLV(DX,7) AND COUNT(DX<0,2) AND CROSS(DX,MA(DX,2));
DRAWTEXT(FILTER(买=1,5),LOW-0.03,'买'),COLORRED;
加仓:=SMA(EMA((C-REF(C,1))/REF(C,1),5)*100,3,1)*10;
DRAWTEXT(FILTER((CROSS(加仓,0) OR CROSS(CLOSE,CB)) AND 买=1,3),LOW-0.03,''),COLORWHITE;
跟:=MA18>=REF(MA18,3) AND CROSS(CLOSE,MA18);
DRAWTEXT(跟,LOW*0.96,'跟'),COLORCC66FF;
解答：
?ma18:=ma(c,18);
mtm:=c-ref(c,1);
