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Ok, here's a way to do it (warning: untested code, I'm just
free-styling here...)
UpVol =IIf(C > O, V, -1);
DownVol =IIf(C < O, V, -1);
UpVol[0] = DownVol[0] = V[0]; // Be sure to start with something
// Loop through to pad the arrays
for (i = 1; i < BarCount; i++)
{
if (UpVol[i] < 0)
{
UpVol[i] = UpVol[i - 1];
}
if (DownVol[i] < 0)
{
DownVol[i] = DownVol[i - 1];
}
Period = Param("Period",3,2,10,1);
UpVolAvg = EMA( UpVol, Period ) ;
DownVolAvg = EMA( DownVol, Period ) ;
Plot(UpVolAvg,"UpVolume", colorGreen);
Plot(DownVolAvg, "DownVolume", colorRed);
- Bill
--- In amibroker@xxxxxxxxxxxxxxx, "l_abarr" <l_abarr@xxx> wrote:
>
> I want UpVolume defined as Volume on days when the Close > Open.
> DownVolume is Volume on days when Close < Open. Then I'd like to plot
> two moving averages: one for UpVolume and one for DownVolume. The
> problem is that on each day there will be no value for either UpVolume
> or DownVolume. So if the Close > Open today, we'd have a value for
> UpVolume (today's Volume) but no value for DownVolume. So I'd like the
> value for DownVolume to remain at yesterday's DownVolume value.
>
> Thanks, I'm new at this, I appreciate your patience.
>
> --- In amibroker@xxxxxxxxxxxxxxx, "steesehwy" <steesehwy@> wrote:
> >
> > The arguments for IIf are (condition, truearray, falsearray). In your
> > first and second lines, you use a value for the "falsearray", not an
> > array.
> >
> > Also, you seem to be trying to repeat the last value for volume when
> > it isn't up or down - that is, repeat the last down volume on an up
> > day. That will cause a falsely weighted average. For example, in a
> > strong up trend, the down-volume average could consist of repeated
> > entries of the last down day's volume. I don't have a good
> > work-around, unless I knew a little more about what you are trying to
> > accomplish.
> >
> > - Bill
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "l_abarr" <l_abarr@> wrote:
> > >
> > > I'm new at this. I'm getting an error in the first line because the
> > > variable 'upvol' hasn't been initialized. I want UpVol to remain the
> > > same as yesterday if C < O. Thanks for any help!
> > >
> > > UpVol =IIf(C > O, V, Ref(UpVol,-1));
> > > DownVol =IIf(C < O, V, Ref(DownVol,-1));
> > > Period = Param("Period",3,2,10,1);
> > > UpVolAvg = EMA( UpVol, Period ) ;
> > > DownVolAvg = EMA( DownVol, Period ) ;
> > > Plot(UpVolAvg,"UpVolume", colorGreen);
> > > Plot(DownVolAvg, "DownVolume", colorRed);
> > >
> >
>
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