MQL4 Reference Array Functions

Group of Functions for Working with Arrays

Arrays are allowed to be maximum four-dimensional. Each dimension is indexed from 0 to dimension_size-1. In a particular case of a one-dimensional array of 50 elements, calling of the first element will appear as array[0], of the last one - as array[49].

Function	Action
ArrayBsearch	Returns index of the first found element in the first array dimension
ArrayCopy	Copies one array into another
ArrayCompare	Returns the result of comparing two arrays of simple types or custom structures without complex objects
ArrayFree	Frees up buffer of any dynamic array and sets the size of the zero dimension in 0.
ArrayGetAsSeries	Checks direction of array indexing
ArrayInitialize	Sets all elements of a numeric array into a single value
ArrayFill	Fills an array with the specified value
ArrayIsSeries	Checks whether an array is a timeseries
ArrayIsDynamic	Checks whether an array is dynamic
ArrayMaximum	Search for an element with the maximal value
ArrayMinimum	Search for an element with the minimal value
ArrayRange	Returns the number of elements in the specified dimension of the array
ArrayResize	Sets the new size in the first dimension of the array
ArraySetAsSeries	Sets the direction of array indexing
ArraySize	Returns the number of elements in the array
ArraySort	Sorting of numeric arrays by the first dimension
ArrayCopyRates	Copies rates to the two-dimensional array from chart RateInfo array returns copied bars amount
ArrayCopySeries	Copies a series array to another one and returns the count of the copied elements
ArrayDimension	Returns the multidimensional array rank

What's new in MQL5

Added functions for quick insertion, deletion, copying and expanding array elements. The new ArraySwap() function swaps the contents of two dynamic arrays of the same type, while the ArrayPrint() function allows you to easily print an array of a simple type or a simple structure in the journal.

For fast and easy visualization, use the Graphics library containing the functions for fast drawing of five chart types with auto scaling, color selection and line smoothing.

ZeroMemoryArrayBsearch