input: n(9,1,60), p(2,1,60), Q(30,1,60);
Direction:=C-REF(C,N);
XX:=ABS(C-REF(C,1));
Volatility:=SUM(XX,N);
ER:=ABS(Direction/Volatility);
FastC:=2/(p+1);
SlowC:=2/(q+1);
SSC:=ER*(FastC-SlowC)+SlowC;
Constant:=SSC*SSC;
YY:=REF(C,1)+Constant*(C-REF(C,1));
AA:=IF(SUM(1,0)=N+1,YY,0);
BB:=BarsLast(AA>0);
DD:REF(C,BB),coloryellow ;
CC:=C;
IF NOT(ISLASTBAR) THEN EXIT;
for m=N + 2 to DATACOUNT DO
DD[m]:=DD[m-1]+Constant[m]*CC[m]-Constant[m]*DD[m-1];
////////////////以上部分单独运行没问题，显示的很好
下面是另加的一行语句
xxx:0.1*STDP((DD-ref(DD,1)) ,20 );
但是这个XXX不显示，请教原因？