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Hi Tomasz,
Thanks for you quick reply...
FWIW, I put the AddColumn statements inside the if statement in a
misguided attempt to eliminate the problem I was seeing. Per your
suggestion, I got rid of the if{} around the AddColumn() statements, but
still have problems and AB is still throwing an exception.
Upon studying the manual some more, I discovered an error in my code
which I think is the root of my problem. ie. I am using a scalar
variable as the first argument in one of the AddColumn() statements
instead of an array variable. However, I do want to print out the
scalar variable Pct_Change in the report. Is there a way to convert the
scalar Pct_Change variable into an array so I can use it in the
AddColumn() function?
Kind regards,
Nick
Here's my revised program which unfortunately still crashes AB:
---- 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);
Pct_Change = 0;
if (Ci != 0)
Pct_Change = 100.0 * ( Ci - Cf )/ Ci;
C1 = (Pct_Change > 0.5);
C2 = (Ci > 2) AND (Cf > 2);
C3 = (Vi > 100000);
Filter = C1 AND C2 AND C3;
AddColumn( C, "Close" );
AddColumn( Pct_Change, "Pct Change" );
AddColumn( V, "Volume" );
---- Script ends before this line -----
On Sun, 4 Mar 2007, Tomasz Janeczko wrote:
> 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>
>
> >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
> >
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> > Help fight the war against Spam;
> > Erase all addresses before forwarding any item of email.
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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