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Ed,
I think instead of "barcount" you might try:
lastBar= lastvalue(valuewhen(datenum()==yourLastDateNum,barindex());
which will return the barnumber at the "yourLastDateNum" point.
Walt
--- In amibroker@xxxxxxxxxxxxxxx, "ed2000nl" <empottasch@xxxx> wrote:
> Using the new option of writing functions in AFL, I wrote a simple
> function ( see code (1) ) to track high volumes in the last ndays
of
> an array. This function I execute in inside the "automatic analysis
> window" using code (2).
>
> If I want to look for buy signals at some point in the past (e.g.
> 6/6/2002) I scan for buy signals for all stocks from 6/6/2002 to
> 6/6/2002. This does not work. It seems to only be able to scan for
> buy signals at the last point in the database.
>
> This is due to "BarCount" in my opinion. How should I rewrite code
> (1) to be able to scan for signals at some date in the past?
>
> thanks in advance, Ed
>
>
> code (1)
> ///////////////////////////////////////////////////////
> // Edward Pottasch, July 2003
> // high_volume.afl returns a 1 if an area if high volume is found
>
> // volume: volume array
> // tdays: number of days over which the average volume is calculated
> // ndays: number of days at the end of the vol array over which the
> average high vol is calculated
> // factor: the factor the average high vol should exceed average vol
>
>
> function high_volume(volume,tdays,ndays,factor)
> {
>
> // initialize first element
> outp = 0;
> vtot = 0;
> vtote = 0;
>
> if (BarCount > tdays) {
>
> // calculate the average volume
> for( i = BarCount - tdays; i < BarCount - ndays;
> i++ ) {
>
> vtot = vtot + volume[ i ];
>
> }
>
> vtot = vtot / tdays;
>
> //
> for( i = BarCount - ndays; i < BarCount; i++ ) {
>
> vtote = vtote + volume[ i ];
>
> }
>
> vtote = vtote / ndays;
>
>
> if ((vtote / vtot) > factor) {
>
> outp[ BarCount - 1 ] = 1;
>
>
> }
> else {
>
> outp[ BarCount - 1 ] = 0;
>
> }
>
> }
>
> return outp;
>
> }
> ///////////////////////////////////////////////////////////////////
>
>
> code (2)
> ///////////////////////////////////////////////////////////////////
> #pragma nocache
> #include <high_volume.afl>
>
> Buy = high_volume(Volume,50,1,6);
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