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.