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You may find the following article from the Knowledge Base helpful. Be sure to read through to the bottom where the definitions being sought are explained.
http://www.amibroker.com/kb/2008/07/03/quickafl/
Mike
--- In amibroker@xxxxxxxxxxxxxxx, "donpickdonpick" <donpick1@xxx> wrote:
>
> Below is some code which finds buy and sell points based on ATR. I am still learning afl code.
>
> My question is regarding the construct:
> for( i = 4; i < BarCount; i++ )
>
> What is the value of BarCount? Is this examining the 4 most recent barcounts?
>
> How many barcounts are being processed? All of them available for a symbol?
>
> Thank you for your help.
>
>
> for( i = 4; i < BarCount; i++ )
> {
> if( L[ i ] >= L[ i-2 ] AND
> L[ i-1 ] >= L[ i-2 ] AND
> L[ i-3 ] >= L[ i-2 ] AND
> L[ i-4 ] >= L[ i-2 ] )
> {
> support[ i ] = L[ i - 2];
> }
> else
> if( L[ i ] > H[ i-1 ] * 1.0013 )
> {
> support[ i ] = H[ i-1 ] * 0.9945;
> }
> else
> if( L[ i ] > support[ i-1 ] * 1.1 )
> {
> support[ i ] = support[ i-1 ] * 1.05;
> }
> else
> {
> support[ i ] = support[ i-1 ];
> }
>
> if( H[ i ] > trends[ i-1 ] AND
> H[ i-1 ] > trends[ i-1 ] )
> {
> trends[ i ] = Max( trends[ i-1 ], support[ i ] );
> }
> else
> if( H[ i ] < trends[ i-1 ] AND
> H[ i-1 ] < trends[ i-1 ] )
> {
> trends[ i ] = Min( trends[ i-1 ], resistance[ i ] );
> }
> else
> if( H[ i ] >= trends[ i-1 ] )
> trends[ i ] = support[ i ];
> else
> trends[ i ] = resistance[ i ];
>
> }
>
> Plot( trends, "Trends", colorRed );
> Plot ( C, "Price", colorBlack, styleCandle );
> //Plot( C, "Price", colorBlack, styleBar ); - Original
> Buy = Cross( C, trends );
> Sell = Cross( trends, H );
>
------------------------------------
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