This article serves as a comprehensive guide to understanding, writing, and implementing to take your trading to the next level. What is AmiBroker Formula Language (AFL)?

// WRONG - This assigns, not compares result = IIf( Variable = 10, High, Low ); // CORRECT result = IIf( Variable == 10, High, Low );

// Example: Custom Trailing Stop Loop StopPrice = Null; InTrade = 0; for( i = 1; i < BarCount; i++ ) if( Buy[i] AND !InTrade ) InTrade = 1; StopPrice[i] = Close[i] * 0.95; // 5% initial stop loss else if( InTrade ) // Trailing stop: Move stop up if price rises, otherwise keep previous stop StopPrice[i] = Max( Close[i] * 0.95, StopPrice[i-1] ); // Check if stopped out if( Low[i] <= StopPrice[i] ) Sell[i] = 1; SellPrice[i] = StopPrice[i]; InTrade = 0; Use code with caution. Custom Functions and External Code Inclusion

A typical production-grade AFL script consists of parameter inputs, technical indicator logic, trade signaling mechanisms, and visual plotting functions. The Basic Structure of a Trading System