// 2. Core Logic (Calculations) fastMA = MA(Close, period1); slowMA = MA(Close, period2);
tool within the Formula Editor to measure how many milliseconds the script takes to run. Loop Optimization : Replace heavy
// --- 3. Strategy logic (verified no look-ahead) --- period = Optimize("Period", 14, 5, 30, 1 ); RSIval = RSI( period ); Buy = Cross( RSIval, 30 ); Sell = Cross( 70, RSIval );
What are you seeing on your chart?
Verified code avoids for() loops where array processing would suffice. It uses static variables ( StaticVarGet/Set ) sparingly.
[Optional: Briefly mention if you have run a backtest and any key findings]. Important Posting Tips Get the Badge:
Functions like Ref(Close, 1) look forward into the next bar. If used in a buy or sell condition during a historical backtest, AmiBroker will execute trades based on information the trader could not possibly have known at that moment. This results in spectacular, yet completely fake, backtest equity curves. Array vs. Scalar Mismatches amibroker afl code verified
Here is a comprehensive guide to understanding, writing, and verifying your AmiBroker AFL code to ensure maximum reliability in live trading markets. Understanding AmiBroker AFL Code Verification
Scan the code for forbidden phrases referring to the current bar:
Disclaimer: Trading stocks and derivatives involves high risk. No trading strategy, including verified AFL codes, guarantees profits. Always backtest thoroughly and use stop-loss orders. If you'd like to dive deeper, I can help you with: a specific formula you are trying to verify. Optimizing your existing AFL code for faster backtesting. Writing a new, custom AFL strategy based on your rules. Strategy logic (verified no look-ahead) --- period =
Plot(Equity(1), "Recalculated Equity", colorRed, styleOwnScale);
: Insert _TRACE() or _TRACEF() functions to output variable values to the Log window in real-time. For complex logic, use the built-in AFL Debugger to step through code line-by-line.
// --- 1. SETUP & SAFETY (Prevents Future Leaks & Crashes) --- SetBarsRequired(100000, 50000); // Allocates enough memory SetTradeDelays(1, 1, 1, 1); // Trade on NEXT bar's open (CRITICAL) SetOption("InitialEquity", 100000); SetOption("MaxOpenPositions", 5); SetPositionSize(20, spsPercentOfEquity); // 20% risk per position [Optional: Briefly mention if you have run a
In algorithmic trading, an unverified line of code is a financial liability. AmiBroker is one of the most powerful and lightning-fast platforms for backtesting and technical analysis, relying on its proprietary AmiBroker Formula Language (AFL). However, the flexibility of AFL is a double-edged sword. A single misplaced semicolon, an overlooked look-ahead bias, or an unhandled null value can turn a seemingly profitable strategy into a catastrophic live-trading failure.
to verify that the code handles "Future Leakage" (using data from the future to make current decisions), which is a common error in unverified scripts. Parameter Testing
