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Hi, Harvey!
Thanks for your help!
I took this as an exercise, too, BTW you're pretty tough for
somebody "learning" AFL!!
I had to replace median price by Avg, as I get a syntax error,
otherwise it works...I just don't see any interest in this
curve...but that's another story!
Thanks again!
Friendly,
Gilles
--- In amibroker@xxxxxxxxxxxxxxx, "harvey_1929" <Hhp@xxxx> wrote:
> Gilles,
> I'm learning AFL so I took a crack at it your code an exercise. Re
> your second message,'Prev' refers to the immediately previous value
> of whatever comes before the equals sign - Bot or RMTA. Because
the
> M'stk Prev function is very slow, AB works around it - seems to
> accept Ref(xxx,-1) as long as it is initialized first, but I had to
> guess at what values to use. If I guessed wrong it should only
> affect the very beginning of your data. This code plots a line,
but
> it's not very pretty. Changing the parameter Ty had no effect,
> which worries me. We'll see what the power users say.
>
> /* *** Recursive Moving Trend Average *** */
>
>
> Lb = Param("Look-Back Period?",21,3,100,1);
> Ty = Param("1=C 2=H 3=L 4=Median Price",1,1,4,1);
>
> Bot = 0;//Initialize Bot
> RMTA = 0;//Initialize RMTA
>
> MP = (H+L)/2;
> Tv = IIf(Ty=1,C,
> IIf(Ty=2,H,
> IIf(Ty=3,L,
> MP)));
> Alpha = 2/(Lb+1);
> Bot = (1-Alpha)*(IIf(Cum(1)<Lb,Tv,Ref(Bot,-1)))+Tv;
> RMTA = (1-Alpha)*(IIf(Cum(1)<Lb,Tv,Ref(RMTA,-1)))+(Alpha*(Tv+Bot-Ref
> (Bot,-1)));
> Plot(RMTA,"",colorRed,styleLine|styleNoLabel); GraphXSpace = 2;
>
> Title = EncodeColor(colorBlack) + FullName() + " [" + Name()
> + "] " +
> WriteVal(DateTime(),formatDateTime) +
> "\n" + EncodeColor(colorBrown) + "Recursive Moving Trend Average: "
> + WriteVal(RMTA,1.2);
> //=====================================
>
> --- In amibroker@xxxxxxxxxxxxxxx, "gillesdeprez"
<gillesdeprez@xxxx>
> wrote:
> > Hello,
> > After fighting for hours, I give up after the fifth line, before
I
> > jump trhu the window, screaming! I know I jump often- I live on
> the
> > ground level.
> > If one of you knows MS and is kind enough to give me a hand...
> > "Recursive moving trend average"
> > Lb:=Input("Look-Back Period?",3,100,21);
> > Ty:=Input("1=C 2=H 3=L 4= Median Price",1,4,1);
> > Tv:=If(Ty=1,C,If(Ty=2,H,If(Ty=3,L,MP())));
> > Alpha:=2/(LB+1);
> > Bot:=(1-Alpha)*(If(Cum(1)<Lb,Tv,PREV))+Tv;
> > RMTA:=(1-Alpha)*(If(Cum(1)<Lb,Tv,PREV))+
> > (Alpha*(Tv+Bot-Ref(Bot,-1)));
> > RMTA
> >
> > TIA!
> > Gilles
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