I have this code but the only thing that plots is the zeroline. Any suggestions?

Inputs:Period(130),Coef(.2),VCoef(2.5), SmoothingPeriods(3);
Vars:TP(0), Inter(0), VInter(0), CutOff(0), VAve(0), VMax(0), VC(0), MF(0),
DirectionalVolume( 0 ), myVFI(0);
TP = TypicalPrice;
if TP > 0 and TP[1] > 0 then
Inter = Log(TP) - Log(TP[1])
else Inter = 0;
VInter = StdDev( Inter, 30 );
CutOff = Coef * VInter * Close;
VAve = Average(V,50)[ 1 ];
VMax = VAve * VCoef;
VC = IFF( V < VMax , V, VMax );
MF = TP - TP[1];
DirectionalVolume = IFF( MF > CutOff, +VC, IFF( MF < -CutOff, -VC, 0 ) );
if VAve <> 0 then
myVFI = Summation( DirectionalVolume, Period ) / Vave
else myVFI = 0;
If SmoothingPeriods > 0 then myVFI = XAverage(myVFI, SmoothingPeriods)
else myVFI = myVFI;
Plot1(myVFI,"VFI",GREEN);
Plot2(0 ,"0");

The code works for me.

I changed line 4 to TP = ( High + Low + Close ) / 3; and it works

On this topic, anyone that owns the Zunaa indicators willing to recode them and post here on io. I think Barry or the creator either passed away or had a very bad accident. The entire company vanished website is gone everything. It was one of the few systems that tested well and used volume, relative volume(r-vol) a few other things. Of course it's no longer available but the concepts are still extremely relevant. Anyone please feel free to respond.

Sent using the NexusFi mobile app

What's the premise behind the volume flow indicator?