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Dean
I wondered what the WriteIf() was doing in an exploration.
Almost every trick that can be applied to indicators can also be applied to experts, and the "Init" bar is particularly helpful with a latch configuration that's based on BarsSince(Event A) relative to BarsSince(Event B). Typically Event A could be Buy and event B a Sell, but not necessarily.
The only significant difference between an indicator, exploration column or section of an expert is the way in which the result is communicated.
N:= "your set signal";
X:= "your reset signal";
Init:=Cum((N OR X) >-1)=1;
State:=BarsSince(Init OR N)<(BarsSince(Init OR X);
State;
Init can also be constructed as follows.
Init:=Cum(IsDefined(N OR X))=1;
Roy
----- Original Message -----
From: longhair4277
To: equismetastock@xxxxxxxxxxxxxxx
Sent: Friday, March 16, 2007 12:47 PM
Subject: [EquisMetaStock Group] Re: Cannot get an indicator to trigger first time around.
Thanks for the reply, but OOPPSS, what a screw up I just made.It's
been a looong day...
I meant an "Expert Advisor", not an "Explorer" Sorry about that.
Thanks
Dean
--- In equismetastock@xxxxxxxxxxxxxxx, "Roy Larsen"
<rlarsen_quik@xxx> wrote:
>
> Longhair
>
>
> There are several ways to eliminate such errors in the Explorer.
An Init function might be part of the solution and is usually
helpful with BarsSince() / ValueWhen() type functions. Another
useful device is to pass an N/A result to one of the Forum DLL
functions (Summing 1 period of the troublesome output should do it).
This converts N/A to 0 which is much easier to work with. If you can
manipulate your code to output zero when there has been no signal in
the scanned range you then have the opportunity to filter out all
invalid/zero results.
>
> The golden rule with all explorations is, of course, to scan
sufficient bars to produce the required result. While this is not
always possible, using "Minimum Records" is guaranteed to fail when
BarsSince() / ValueWhen() type functions are included in exploration
formulas.
>
>
> Roy
>
>
> ----- Original Message -----
> From: longhair4277
> To: equismetastock@xxxxxxxxxxxxxxx
> Sent: Friday, March 16, 2007 11:59 AM
> Subject: [EquisMetaStock Group] Re: Cannot get an indicator to
trigger first time around.
>
>
> --- In equismetastock@xxxxxxxxxxxxxxx, "Jose Silva"
> <josesilva22@> wrote:
> >
> > Init:=Cum(IsDefined(RoaR))=2;
> >
> > Steve, the Init variable above holds an initialization signal
when
> the
> > RoaR plot has been defined/valid (i.e., not N/A) for two bars.
> This
> > initialization/seeding is necessary because the BarsSince()
> conditions
> > create null (N/A) bars prior to the first crossover reference
> signal.
> >
> > So, why not "Init:=Cum(IsDefined(RoaR))=1;" instead?
> > Because the Cross() function adds a null bar and would miss that
> first
> > initialization signal.
> >
> > Creates/adds null bars? It sounds like "creating a void or
> vacuum".
> > Doesn't sound right but hopefully you get my meaning.
> >
> >
> > jose '-)
> > http://www.metastocktools.com
> >
> >
> Is there anyway do do an "init" in an explorer?
> As an example of what I am trying to accomplish. This is a snipet
of
> the code that I have in the explorer:
> The most recent High Beta was writeif( BarsSince(Fml( "!QUTSH -
> Setup Day - High Beta") ) < BarsSince(Fml( "!QDTSH - Setup Day -
> High Beta") ) , "an UPTREND" , "a DOWNTREND")
>
> This produces the following error until I get 1 valid signal:
> (*ERROR*: Function is not defined for the current date)
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
[Non-text portions of this message have been removed]
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