The final stage of verification is connecting your clean logic to an execution environment.
Verified code is not just “correct” under ideal conditions; it handles edge cases gracefully.
Example header for verified AFL:
: Set breakpoints to pause execution and hover over variables to see their current values. amibroker afl code verified
Use Buy = ExRem(Buy, Sell); . This function removes all redundant Buy signals until a Sell signal resets the chain. Prevent the "Future Leak" in Calculations
StaticVarSet("LastSignalTime", LastValue(DateTime()));
By default, AmiBroker might execute a trade on the same bar a signal occurs. In reality, you usually see a signal at Sunday's close and execute on Monday's open. Failing to set trade delays results in unverified, highly inflated backtest performance. 3. Price Array Mismatches The final stage of verification is connecting your
After your code, add:
The script must avoid "future leaks." This happens when a backtest looks at future data to make past decisions. Verified code uses proper lookback periods. 3. Data Compatibility
Amibroker Formula Language (AFL) serves as the backbone for traders and quantitative analysts who use AmiBroker for charting, backtesting, and strategy development. The phrase “AFL code verified” carries significance for both individual developers and professional teams—it signals that a given AFL script has passed checks for correctness, reliability, and expected behavior. This essay examines what “verified” means in the context of AFL, why verification matters, common verification methods, and best practices to ensure an AFL script is robust, maintainable, and trustworthy. Use Buy = ExRem(Buy, Sell);
Syntactical errors stop code from running, but logical errors are worse. Logical errors allow the code to execute incorrectly without triggering an alert.
represents the critical transition of a quantitative trading strategy from an unstable, unconfirmed script into a reliable, mathematically validated algorithm. For systematic traders, running unverified code on live trading capital introduces severe financial risks, ranging from array boundary syntax crashes to silent, catastrophic backtesting biases like look-ahead anomalies.
Ensure you never use positive indices like Ref(Close, 1) for entry rules.
: Note that generating full reports for large batches (like optimizations) will significantly slow down the process and consume more disk space. 3. Basic Backtest Verification Code