The _TRACE() function allows you to print variables and signal states directly to AmiBroker's DebugView window. This is incredibly useful for verifying loops ( for and while ) and complex if-else structures.
: The code utilizes AmiBroker's array-processing engine efficiently to avoid memory leaks. Common Pitfalls That Ruin AFL Verification
Does the strategy have long periods of losses? C. Check for "Repainting" (The Most Critical Step)
Verification is not just "no syntax errors." In the professional trading community, verification covers five distinct layers: amibroker afl code verified
// ----- 5. Remove Consecutive Duplicate Signals ----- Buy = ExRem(Buy, Sell); Sell = ExRem(Sell, Buy); Short = ExRem(Short, Cover); Cover = ExRem(Cover, Short);
This guide explores what makes AFL (AmiBroker Formula Language) code trustworthy, how to verify it yourself, and where to find high-quality, pre-verified AFL codes. 1. What Does "AmiBroker AFL Code Verified" Actually Mean?
// UNVERIFIED (Error: Buys every bar after a short) Short = Sell = Cover = 0; Buy = Cross(MACD(), Signal()); The _TRACE() function allows you to print variables
| Issue | Symptom | Verification | Fix | |--------|---------|--------------|-----| | Array reference Ref(..., -1) at bar 0 | Signal on first bar uses future data | Check first 2 bars in exploration | Add BarIndex() > 0 condition | | Using LastValue() inside loop | Signals change unpredictably | Plot LastValue output | Avoid loops; use array processing | | Wrong StaticVar scope | Values spill across symbols | Test on two symbols sequentially | Reset with StaticVarSet("name", Null, -1) | | Zero division | Plot blanks or NaN | Add IIf(Denom != 0, Num/Denom, 0) | Always guard division |
Set your BuyPrice and SellPrice to Open . This simulates entering the trade at the market open the morning after a signal triggers.
You can force AmiBroker to generate a full report for every test by adding the following SetOption command to your AFL code: Common Pitfalls That Ruin AFL Verification Does the
Have you checked all Ref() functions to ensure no positive integers (e.g., Ref(C, 1) ) are being used?
Before deeper verification, know the most frequent coding pitfalls:
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