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Cum(x<>-101) is an attempt to accumulate valid indicator bars - as
opposed to N/A bars that may produce division errors.
Cum(x>-1) may not work in some instances because there could be
negative values lurking in some indicator ("P") bars.
-101 was chosen arbitrarily because it's unlikely to occur in the
indicator's prior data set.
To avoid confusion and possible problems, a better way to find valid
bars would be this:
Cum(IsDefined(x))
"pds:=If(pds>Cum(IsDefined(x))-VAvgPds,Cum(IsDefined(x))-VAvgPds,pds);
"
jose '-)
--- In equismetastock@xxxxxxxxxxxxxxx, "bbinns24" <bbinns24@xxxx>
wrote:
> "pds:=If(pds>Cum(x<>-101)-VAvgPds,Cum(x<>-101)-VAvgPds,pds);
>
> "What is a True/False symbol doing in Cum(Data Array)in above
> statement. X=close; (close not equal to minus 101)minus VAvgPds;
>
> Is this correct??? Any enlightenment would be appreciated.Full
> formula is below.
>
>
>
> {EMA - Volume adjusted}
>
>
> { Volume adjusted, dynamic-period EMA v2.2 } { EMA periodicity
> shortens on
> high volume,
> increases on low volume }
> { Copyright 2003 Jose Silva }
> { http://users.bigpond.com/prominex/pegasus.htm }
>
> pds:=Input("EMA periods",1,2520,21);
> VAvgPds:=Input("Volume sample periods",
> 2,252,21);
> x:=Input("use Open=1 High=2 Low=3 Close=4 Volume=5 P=6",1,6,4);
> shift:=1+Input("EMA vertical shift %", -100,100,0)/100; plot:=Input
> ("EMA=1,
> Dyn EMA pds=2, Vol avg=3, Crossovers=4",1,4,1);
>
> x:=If(x=1,O,If(x=2,H,If(x=3,L,If(x=5,V,If(x=6,P,C)))));
> MovVol:=Mov(V,VAvgPds,E);
> VolRatio:=Min(V,MovVol)/Max(V,MovVol);
> VolAvg:=If(V>MovVol,2-VolRatio,VolRatio);
> multi:=.75/(.1+.32*VolAvg+.58*Power(VolAvg,4));
> pds:=pds*multi;
> pds:=If(pds>Cum(x<>-101)-VAvgPds,
> Cum(x<>-101)-VAvgPds,pds);
> pds:=If(pds<1,1,pds);
> VlEma:=x*2/(pds+1)+PREV*(1-2/(pds+1));
> VlEma:=VlEma*shift;
> signals:=Cross(x,VlEma)-Cross(VlEma,x);
>
> If(plot=2,pds,If(plot=3,VolAvg*50,
> If(plot=4,signals,VlEma)))
>
> *************************************************************
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