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AddColumn must NOT be put inside conditional statement.
So remove this:
if( Filter != 0 )
(AB automatically handles filtering so it is compeltely NOT necessary)
Simply: when everything fails READ THE MANUAL
http://www.amibroker.com/guide/h_exploration.html
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "Nick Busigin" <nick@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Sunday, March 04, 2007 6:45 PM
Subject: [amibroker] Exploration AFL is causing AB to throw and exception
>I am trying to create an exploration which allows me to pick out stocks
> that meet a number of conditions over a customizable time interval.
> Here's my approach:
>
> 1) Double Click in Chart to set begin and end markers.
> 2) Open Automatic Exploration window
> 3) Set Range to last n bars, with n=1
> 4) Pick Exploration AFL (shown below)
> 5) Click on Explore.
>
> Unfortunately, I keep having AB throw an exception and ask me if I want
> to submit a bug report. I have done so, but I also thought it worth
> asking the experienced AFL coders on this list what they may see that I
> am doing wrong. Here's my AFL script:
>
> ---- Script begins after this line -----
> /*
> * Scan for stocks in an Interval that have:
> *
> * - a higher Close at the end of the interval than at the beginning of
> * the interval
> * - a price higher than 2
> * - a volume higher than 100,000 (based on bar at the beginning of the
> * interval)
> *
> * NOTE: YOU MUST SET THE BEGIN AND END MARKERS ON THE CHART BEFORE
> * RUNNING THIS EXPLORATION.
> */
>
> Ci = BeginValue(C);
> Cf = EndValue(C);
> Vi = BeginValue(V);
>
> if (Ci != 0) {
> Pct_Change = 100.0 * ( Ci - Cf )/ Ci;
>
> C1 = Pct_Change > 0.5;
> C2 = Ci > 2 AND Cf > 2;
> C3 = Vi > 100000;
> }
> else{
> C1 = 0;
> C2 = 0;
> C3 = 0;
> }
>
> Filter = C1 AND C2 AND C3;
>
> if( Filter != 0 )
> {
> AddColumn( C, "Close" );
> AddColumn( Pct_Change, "Pct Change" );
> AddColumn( V, "Volume" );
> }
> ---- Script ends above this line -------
>
> Some of the conditional logic is in the code as an attempt to get around
> the problem I am running into. Can anybody see what's causing the
> exception?
>
> Kind regards,
> Nick
>
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>
>
> Please note that this group is for discussion between users only.
>
> To get support from AmiBroker please send an e-mail directly to
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>
> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
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