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Correction to this section (Buy and Sell should be outside the loop) but does not make a material difference:
//--------------------------------------------------------
// BACKTEST SOME CONDITIONS:
//
// Want to backtest a group of 9 Conditions
//
// So we dump to an Include file and cycle through
// the conditions against historical data
//--------------------------------------------------------
#include "c:\\ConditionsFile.afl";
Buy = Sell = Short = Cover = PositionScore = 0;
for ( a = 1; a < 10; a++ )
{
fh = fopen( "c:\\ConditionsFile.afl", "w");
fputs(ConditionGenerator(a), fh);
fclose( fh );
Condition = VarGet( "Condition" + NumToStr( a, 1.0, 0 ) );
Buy = Buy OR Condition;
PositionScore = IIf( Condition AND NOT PositionScore, a, PositionScore );
}
//--------------------------------------------------------
Buy = ExRemSpan(Buy, 12);
Sell = Ref(Buy, -12);
>
> Hello, I got some great help from Mike (sfclimbers) in solving the first
> half of this problem, of cycling through a group of Buy conditions,
> adding a custom metric, and identifying conditions per trade . Thought
> all my issues were completely solved, but ran into an unexpected
> stumbling block when I tried to apply it to my actual trading system,
> which makes extensive use of Include files, and string generating
> algorithms. Hoping someone can help in pointing out my error (maybe even
> Mike if he ain't tired of me yet ;-) First, here is a block of code that
> *does* work, and gives the simple essence of what I want to achieve.
> This system outlines 9 different conditions, cycles through all in a
> backtest, and adds a column to the backtester to indicate which
> Condition was used for which trade:
>
>
> //--------------------------------------------------------
> // SIMPLE TRADING SYSTEM BASED ON VARIOUS CONDITIONS
> //--------------------------------------------------------
>
>
> Condition1 = C > Ref(C, -1) AND Cross(C, MA(C,2) );
> Condition2 = C > Ref(C, -2) AND Cross(C, MA(C,4) );
> Condition3 = C > Ref(C, -3) AND Cross(C, MA(C,6) );
> Condition4 = C > Ref(C, -4) AND Cross(C, MA(C,8) );
> Condition5 = C > Ref(C, -5) AND Cross(C, MA(C,10) );
> Condition6 = C > Ref(C, -6) AND Cross(C, MA(C,12) );
> Condition7 = C > Ref(C, -7) AND Cross(C, MA(C,14) );
> Condition8 = C > Ref(C, -8) AND Cross(C, MA(C,16) );
> Condition9 = C > Ref(C, -9) AND Cross(C, MA(C,18) );
>
>
>
> //--------------------------------------------------------
> // BACKTEST THE ABOVE GROUP OF CONDITIONS:
> //--------------------------------------------------------
>
> Buy = Sell = Short = Cover = PositionScore = 0;
>
> for ( a = 1; a < 10; a++ )
> {
> Condition = VarGet( "Condition" + NumToStr( a, 1.0, 0 ) );
>
> Buy = Buy OR Condition;
>
> // Reserved variable "PositionScore" is used to store the
> // Condition numbers whenever a Condition is True:
>
> PositionScore = IIf( Condition AND NOT PositionScore, a, PositionScore
> );
> }
>
> Buy = ExRemSpan(Buy, 12);
> Sell = Ref(Buy, -12);
>
>
>
> //--------------------------------------------------------
> // ADD THE CUSTOM COLUMN, "CONDITION" TO BACKTEST REPORT
> //--------------------------------------------------------
>
> SetCustomBacktestProc( "" );
>
> if ( Status( "action" ) == actionPortfolio )
> {
> bo = GetBacktesterObject();
>
> bo.Backtest( 1 ); // run default backtest procedure
>
> // iterate through closed trades first
>
> for ( trade = bo.GetFirstTrade(); trade; trade = bo.GetNextTrade
> () )
> {
> trade.AddCustomMetric( "Condition", trade.Score );
> }
> bo.ListTrades();
> }
>
> Now in my actual trading system, I rely on a rather complex algorithm,
> to generate "Conditions" on the fly. Each such variable assignment is
> generated as a block of code, a few lines long, in string format. If I
> wanted to test out a handful of such conditions, it's no problem to
> simply paste the variable assignments directly into the AFL. However,
> when I want to cycle through thousands of such conditions, pasting does
> not work. Amibroker understandbly crashes. So the solution is to
> generate each variable assignment, one at a time, and dump to an
> external file which is #Included into the main AFL. At any one time, the
> external file only contains a single variable assignment. The problem
> arises when I loop through the external file. Only the last Condition is
> ever recognized as a Buy. I've tried using interim static variables, and
> AddToComposite to store true/false data for each condition, and test
> against that. But nothing seems to work. Below is the basic code. Note
> that the function ConditionGenerator() is not the one in my actual
> trading system, but a much more simplified version for debug purposes.
>
> As mentioned, only Condition9 ever gets set as a Buy in the backtest
> report. How do I get *all* conditions to be properly tested for
> potential Buys, so that this block of code essentially mimics the above
> block? (note you may first have to create a blank file on your drive,
> "c:\\ConditionsFile.afl" before running the code).
>
>
> //---------------------------------------------------------
> // FUNCTION: ConditionGenerator()
> //
> // When called, this function generators buying
> // conditions, as a string, based on a simple algorithm.
> //
> // For e.g. ConditionGenerator(2) results in:
> //
> // " Condition2 = C > Ref(C, -2) AND Cross(C, MA(C,4) ); "
> //---------------------------------------------------------
>
> function ConditionGenerator(X)
> {
> Y = X * 2;
>
> string = "Condition"+ NumToStr(X, 1.0,0) +" = C > Ref(C, -"
> + NumToStr(X, 1.0,0)+ ") AND "
> + "Cross(C, MA(C,"+NumToStr(Y, 1.0,0) + ") );" ;
>
> return string;
> }
> //--------------------------------------------------------
>
>
>
>
> //--------------------------------------------------------
> // BACKTEST SOME CONDITIONS:
> //
> // Want to backtest a group of 9 Conditions
> //
> // So we dump to an Include file and cycle through
> // the conditions against historical data
> //--------------------------------------------------------
>
> #include "c:\\ConditionsFile.afl";
>
> Buy = Sell = Short = Cover = PositionScore = 0;
>
> for ( a = 1; a < 10; a++ )
> {
> fh = fopen( "c:\\ConditionsFile.afl", "w");
> fputs(ConditionGenerator(a), fh);
> fclose( fh );
>
> Condition = VarGet( "Condition" + NumToStr( a, 1.0, 0 ) );
>
> Buy = Buy OR Condition;
>
> PositionScore = IIf( Condition AND NOT PositionScore, a, PositionScore
> );
>
> Buy = ExRemSpan(Buy, 12);
> Sell = Ref(Buy, -12);
> }
> //--------------------------------------------------------
>
>
>
>
> //--------------------------------------------------------
> // ADD THE CUSTOM COLUMN, "CONDITION" TO BACKTEST REPORT
> //--------------------------------------------------------
>
> SetCustomBacktestProc( "" );
>
> if ( Status( "action" ) == actionPortfolio )
> {
> bo = GetBacktesterObject();
>
> bo.Backtest( 1 ); // run default backtest procedure
>
> // iterate through closed trades first
>
> for ( trade = bo.GetFirstTrade(); trade; trade =
> bo.GetNextTrade() )
> {
> trade.AddCustomMetric( "Condition", trade.Score);
> }
> bo.ListTrades();
> }
>
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