Dynamic Arrays
Maximum 4-dimensional arrays.
Declared with an unspecified first dimension (e.g., double matrix[][10][20];).
Compiler automatically creates a dynamic array object for correct initialization.
Automatically freed when exiting their block's visibility area.
Example: ArrayResize(matrix, 5); to set the first dimension size.Static Arrays
All significant array dimensions are explicitly specified (e.g., double stat_array[5];).
Compiler pre-allocates the necessary memory.
A dynamic array object is associated with the static array's buffer for function parameter passing.
Example: some_function(stat_array); where some_function accepts double& array[].Arrays in Structures
Static arrays declared as structure members do not create a dynamic array object by default (for Windows API compatibility).
Static arrays within structures can be passed to MQL5 functions.
When passed to MQL5 functions, a temporary dynamic array object is created, linked to the structure member.Related Topics
[Array Functions](/array)
[Initialization of Variables](/basis/variables/initialization)
[Visibility Scope and Lifetime of Variables](/basis/variables/variable_scope)
[Creating and Deleting Objects](/basis/variables/object_live)