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Hi,
Prev is a Mstock function ( very slow) and has the function of a loop
Amibroker with script is faster, and amibroker has a AMA function
for exp average
The calculation of the popular indicator On Balance Volume
illustrates the use of the PREV function.
(if(c>ref(c,-1),1,-1)*volume)+PREV
stephane
> hi rob.
> The prev line in the code looks like an EMA.
>
> an example of prev is.
>
> ((h+l+c)/3)+ prev
> this divides the h,l,and c by 3 and then adds this to yesterdays
> value of the ((h+l+c)/3).
>
> an %18 ema , about 10 days is created by
>
> (close*0.18)+(prev*0.82)
>
> prev confuses me as i wouldnt mind knowing what it does when
applied
> to certain true conditions in formulas, the MS manual only shows
> simple examples. i dont know if the prev was yesterday or if it
was
> a value of when the cond was true.
> If anyone can explain, please do.
>
>
> cheers: john.
>
>
>
>
> --- In amibroker@xxxx, Robert Nemeth <rjnemeth@xxxx> wrote:
> > I wanted to let you know someone is looking at this
> > since I haven't seen any other posts on this topic.
> > Below is some code I've been playing with as an
> > indicator. Could you tell me what is "PREV" in the MS
> > code in your message?
> > Tnx
> > Bob
> > scHilbertQ(C);
> > //Plot(inphase,"",2,1); //not used
> > //Plot(quadrature,"",3,1); //not used
> > inr=IIf(inphase>Ref(inphase,-1),1,0);
> > qr=IIf(quadrature>Ref(quadrature,-1),1,0);
> > inpr=IIf(inr*qr>0,1,0);
> > inpf=IIf(inr+qr<1,-1,0);
> > ipres=inpr+inpf;
> > iqne=qr*inr<1 AND qr+inr==1;
> > opres=iqne*(IIf(inr,1,-1));
> > Plot(ipres,"",2,1);
> > //Plot(opres,"",3,1); //only one plot at a time
> > --- nenapacwanfr <nenapacwanfr@xxxx> wrote:
> > > Hello,
> > >
> > > I have had an idea with a detrender, so I have
> > > written the Hilbert
> > > quadrature and hilbert inphase as plugins they are
> > > available in the
> > > files /plugin/indicator dll
> > > if you have interest,
> > > you can plot them with
> > > scHilbertQ(C);
> > > Plot(inphase,"",2,1);
> > > Plot(quadrature,"",3,1);
> > >
> > > the code in Ms was
> > > /*
> > > value1:=C - Ref(C,-6);
> > > value2:= Ref(value1,-3);
> > > value3:=0.75*(value1-Ref(value1,-6)) +
> > > 0.25*(Ref(value1,-2)-Ref
> > > (value1,-4));
> > >
> > > inphase:= (0.2 * value2) + (0.8* PREV);
> > > {Ema 9 jours}
> > > quad:= (0.2 * value3) + ( 0.8 * PREV);
> > > {Ema 9 jours}
> > > inphase
> > > */
> > >
> > > stephane
> > >
> > >
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