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Ron
I'm glad I got something right first time. It hasn't been a good week in
that regard and I've looked a bit of an idiot at times.
Any function that uses "Nth" event can also benefit from a simple piece of
initialisation code. It works better than IsDefined() or Is Undefined(), but
that's not really any sort of recommendation I guess.
Roy
----- Original Message -----
From: "Ron" <ronber@xxxxxxxxxxxxx>
To: <equismetastock@xxxxxxxxxxxxxxx>
Sent: Saturday, July 26, 2003 4:21 PM
Subject: Re: [EquisMetaStock Group] Barssince in exploration
> Roy-
>
> ...My example of..
> BarsSince(Cum(1)=1 OR C<=3)>10;
> is probably not going to deliver the result you are looking for - you will
> need to modify the code for that. However use of "Cum(1)=1 OR" will
address
> the BarsSince failure that you have....
>
> Actually it does give me what I want. And provdes a solution for other
> instances where I want to assure that some token hasn't exceeded/ fallen
> below some value for x days.
> Thanks.
>
> Ron
>
> Roy Larsen wrote:
>
> > Ron
> >
> > > I'm using the following expression:
> > >
> > > Barssince(C<=3)>10
> > >
> > > I take this to mean that in the last 10 bars the ticker has been at
> > least
> > 3.
> > >
> > > That would lead to 1's and 0's appearing in the column.
> > >
> > > In many cases I'm getting N/A in the column. What is triggering that?
> > > What does it mean? I thought that the Barssince expression was truly
> > > boolean.
> >
> > BarsSince() should be applied to an event (condition change) rather than
> > just a condition. There are two parts to the solution. First, you must
> > make
> > your exploration scan more periods than the last 10 bars (which you are
> > probably already doing), and second, you should add an "initialisation"
> > event into the code. Cum(1)=1 is all that's required in this case. What
it
> > does is it forces an event that BarsSince() can use as a reference point
> > when C<=3 doesn't.
> >
> > The problem you are seeing is because N/A will be reported by any issue
> > where "C<=3" was never true during the scanned period.
> >
> > This trick of using an initialisation signal is also useful with
> > ValueWhen()
> > and one or two other functions. In most cases the value returned when
the
> > init signal is given is quite irrelevant - what is relevant it that
> > the N/A
> > period is eliminated or drastically reduced.
> >
> > My example of..
> > BarsSince(Cum(1)=1 OR C<=3)>10;
> > is probably not going to deliver the result you are looking for - you
will
> > need to modify the code for that. However use of "Cum(1)=1 OR" will
> > address
> > the BarsSince failure that you have.
> >
> > Roy
> >
> >
> >
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