Afl Code Verified ((top)) | Amibroker
Verification means proving your code executes exactly how you intend. In AmiBroker, this involves checking for syntax correctness, logical soundness, data integrity, and execution speed. A verified AFL code guarantees that your buy and sell signals trigger on the correct bars without looking into the future or lagging behind. The Core Pillars of AFL Verification
Absolute bar numbers vary with padding, QuickAFL, and aligned symbols, causing signals to disappear in backtests.
Once the code is verified, the trader's mindset shifts. They no longer trade based on a "feeling" about a candle; they trade based on a . amibroker afl code verified
Follow this checklist to manually verify any AFL script you download from the internet or write yourself. Step 1: Use the Built-in AFL Editor Check Open your code inside the AmiBroker AFL Editor.
: The code executes buy and sell signals exactly when your strategy rules dictate. Verification means proving your code executes exactly how
Visuals can be deceiving. You need to verify the exact numbers behind the calculations.
Ideal for high-frequency historical data analysis. The Core Pillars of AFL Verification Absolute bar
: When verification fails, AmiBroker highlights the exact line and column where the error occurred. The DebugView
Contains explicit rules for entry, exit, position sizing, and risk management. 2. Common Errors in Unverified AFL Code
for( i = 0; i < BarCount; i++ ) if( Buy[i] ) _TRACE("Buy Signal generated at Bar: " + i + " Use code with caution. Step B: Eliminate Array-to-Number Errors
//============================================================================ // SYSTEM NAME: Verified Dual Moving Average Crossover //============================================================================ // 1. System Settings SetOption("InitialEquity", 100000); SetOption("DefaultPositions", 5); SetTradeDelays( 1, 1, 1, 1 ); // Standardize delays to avoid look-ahead bias // 2. Core Indicators & Parameters fastPeriod = Param("Fast MA Period", 10, 2, 50, 1); slowPeriod = Param("Slow MA Period", 30, 10, 200, 1); fastMA = MA( Close, fastPeriod ); slowMA = MA( Close, slowPeriod ); // 3. Trading Logic (Signals) Buy = Cross( fastMA, slowMA ); Sell = Cross( slowMA, fastMA ); Short = 0; Cover = 0; // 4. Execution Prices BuyPrice = Open; // Executed on the next bar's open due to SetTradeDelays SellPrice = Open; // 5. Code Verification & Debugging Section Filter = Buy OR Sell; AddColumn( Close, "Close Price", 1.2 ); AddColumn( fastMA, "Fast MA", 1.2 ); AddColumn( slowMA, "Slow MA", 1.2 ); // 6. Chart Plotting Plot( Close, "Price", colorCandle, styleCandle ); Plot( fastMA, "Fast MA", colorGreen, styleLine ); Plot( slowMA, "Slow MA", colorRed, styleLine ); PlotShapes( Buy * shapeUpArrow, colorGreen, 0, Low ); PlotShapes( Sell * shapeDownArrow, colorRed, 0, High ); Use code with caution. 4. Advanced Verification Strategies
