Verification in AmiBroker refers to the process of checking your AmiBroker Formula Language (AFL) code for syntax errors before applying it to charts or running analysis. This essential step ensures the software can interpret your logic correctly. 🛠️ The Internal "Verify Syntax" Tool The primary way to verify code is through the AFL Editor.
Action: Click the "Verify Syntax" icon (a checkmark) or press the shortcut key (usually in the Tools menu).
Function: It parses the code to find typos, missing semicolons, or incorrect function calls.
Feedback: If errors exist, the editor scrolls to the first mistake and provides a description, such as "Error 10" (syntax error) or "Error 29" (variable used without initialization). 🧪 Advanced Verification Techniques
Beyond simple syntax checks, advanced users "verify" the logic of their code using these methods:
_TRACE() and _TRACEF(): Use these functions to print variable values to the Log window, allowing you to see what happens line-by-line.
Built-in Debugger: Set breakpoints to pause execution and hover over variables to see their current values.
Exploration Display: Use AddColumn() in the Analysis window to output array data into a spreadsheet format for manual verification. amibroker afl code verified
Visual Check: Use Plot() or PlotShapes() to draw conditions on the chart, confirming that buy/sell arrows appear exactly where you expect them. ⚠️ Important Considerations
How do I debug my formula? - AFL Programming - Amibroker Forum
[Title Suggestion]: Verified AFL Trading Strategy – [Insert Strategy Name, e.g., EMA Cross with RSI Filter] 1. Strategy Overview
[Briefly explain how the code works, e.g., "This strategy enters long when the 50-period EMA crosses above the 100-period EMA while the RSI is above 50"]. Timeframe: [e.g., 5-minute, Daily, Weekly]. Asset Class: [e.g., Equities, Forex, Indices]. 2. Verified AFL Code Always use code blocks ( ) when posting on the AmiBroker Forum to ensure it is readable and easy for others to copy.
/* Verified Strategy: [Strategy Name] Requirements: License Verified Badge */
SetChartOptions(0, chartShowDates); _SECTION_BEGIN("Trading Logic");
// Variables MA_Fast = MA(C, 50); MA_Slow = MA(C, 100); RSI_Val = RSI(14); Verification in AmiBroker refers to the process of
// Entry and Exit Conditions Buy = Cross(MA_Fast, MA_Slow) AND RSI_Val > 50; Sell = Cross(MA_Slow, MA_Fast) OR RSI_Val < 30;
// Visuals Plot(MA_Fast, "EMA 50", colorGreen, styleLine); Plot(MA_Slow, "EMA 100", colorRed, styleLine); PlotShapes(Buy * shapeUpArrow, colorGreen, 0, Low); PlotShapes(Sell * shapeDownArrow, colorRed, 0, High);
_SECTION_END(); Use code with caution. Copied to clipboard 3. Verification Status My account has the "License Verified" Backtest Results:
[Optional: Briefly mention if you have run a backtest and any key findings]. Important Posting Tips Get the Badge:
On the official AmiBroker forums, you must have the "License Verified" badge to create new topics or ask questions. You can verify your license through the AmiBroker Members Zone Show Your Work:
When asking for help, always post the code you have already tried rather than just a description. This makes it easier for the community to debug. Formatting: [Optional: Briefly mention if you have run a
Use the "Prettify" feature in the AmiBroker AFL Editor before pasting to ensure consistent indentation.
Accuracy in Backtesting: Verified AFL code ensures that the backtesting results of your trading strategies are accurate. This means that the performance metrics you obtain (like profit/loss, drawdown, etc.) are reliable.
Reliability: It guarantees that the indicators and strategies will behave as expected in live markets, reducing the risk of unexpected losses due to coding errors.
Efficiency: Verified code often runs more efficiently, which is crucial for real-time analysis and automated trading systems.
Create a separate verification AFL that runs your core logic on synthetic data.
Example:
// Synthetic price Close = 100 + Cum(1) % 20; Open = Close; High = Close+1; Low = Close-1;
// Insert your AFL here (e.g., Buy = Cross(RSI(14), 30)) // Then verify outputs Plot(Buy, "Buy Signal", colorGreen, styleHistogram);
This removes market noise and tests pure logic.