MQL5 array direction
ArraySetAsSeries cannot set the AS_SERIES flag on a static array or a multidimensional array. Declare a dynamic one-dimensional numeric array, call ArraySetAsSeries on it, and check the returned bool. Indicator buffers may also need the call after SetIndexBuffer because binding resets their indexing to ordinary array order.
Open the Coding Agent and choose MQL5 from the language menu.
double values[];
int OnInit()
{
if(!ArrayResize(values,100))
return INIT_FAILED;
if(!ArraySetAsSeries(values,true))
{
Print("ArraySetAsSeries failed");
return INIT_FAILED;
}
return INIT_SUCCEEDED;
}AS_SERIES changes logical indexing so element zero represents the newest value. The official ArraySetAsSeries contract limits that flag to dynamic one-dimensional numeric arrays.
A declaration such as double values[100] is static because its size is fixed in source. Changing the requested flag cannot turn that allocation into a dynamic array.
Use a dynamic array when the code needs series direction. Keep a static array when fixed storage is intentional, but index it in its normal direction.
| Declaration | AS_SERIES | Use |
|---|---|---|
| double data[] | Supported | Dynamic timeseries-style processing |
| double data[100] | Not supported | Fixed-size ordinary indexing |
| double data[][2] | Not supported | Multidimensional ordinary indexing |
SetIndexBuffer binds a dynamic array to an indicator buffer. The official documentation notes that the bound buffer uses ordinary array indexing after binding, so call ArraySetAsSeries afterward if the calculation expects newest-bar indexing.
The array has no compile-time size, remains one-dimensional, and checks both resize and direction setup. An indicator buffer should be bound first and then have its direction set.
A clean compile or a cleared error code does not prove strategy logic, broker compatibility, backtest quality, or live-trading safety. Reproduce the result in the target MetaTrader 5 terminal and account environment.
double values[];
int OnInit()
{
if(!ArrayResize(values,100))
return INIT_FAILED;
if(!ArraySetAsSeries(values,true))
{
Print("ArraySetAsSeries failed");
return INIT_FAILED;
}
return INIT_SUCCEEDED;
}Pineify can generate or revise MQL5 source and use MQL5 compilation diagnostics during the coding workflow. Keep the exact error, source location, program type, and intended behavior in the request so the change remains reviewable.
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Confirm that the target is a one-dimensional numeric array without a compile-time size.
When the array is an indicator buffer, call SetIndexBuffer before changing its indexing direction.
Call ArraySetAsSeries(array, true) and stop or log when it returns false.
Verify that loops, CopyBuffer calls, and prev_calculated logic all use the same indexing convention.
No. The official reference says the AS_SERIES flag cannot be set for static arrays or multidimensional arrays.
For an indicator buffer, bind it with SetIndexBuffer first, then set the desired direction. Binding sets ordinary indexing for the buffer.
No. It changes logical indexing direction. ArrayResize controls the size of an ordinary dynamic array, while the terminal manages the size of a bound indicator buffer.
Last verified against the linked official references on . Compile and test the final source in the MetaTrader 5 build, broker, symbol, and account environment you plan to use.
Provide the exact diagnostic and intended behavior, inspect the generated change, compile it, and verify it in your MT5 test environment.
Open MQL5 Coding Agent