MQL4 Reference 
MQL5 features MQL5 functions 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
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Action
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ArrayBsearch
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Returns index of the first found element in the first array dimension
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ArrayCopy
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Copies one array into another
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ArrayCompare
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Returns the result of comparing two arrays of simple types or custom structures without complex objects
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ArrayFree
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Frees up buffer of any dynamic array and sets the size of the zero dimension in 0.
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ArrayGetAsSeries
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Checks direction of array indexing
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ArrayInitialize
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Sets all elements of a numeric array into a single value
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ArrayFill
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Fills an array with the specified value
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ArrayIsSeries
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Checks whether an array is a timeseries
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ArrayIsDynamic
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Checks whether an array is dynamic
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ArrayMaximum
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Search for an element with the maximal value
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ArrayMinimum
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Search for an element with the minimal value
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ArrayPrint
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Prints an array of a simple type or a simple structure into journal
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ArrayRange
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Returns the number of elements in the specified dimension of the array
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ArrayResize
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Sets the new size in the first dimension of the array
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ArrayInsert
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Inserts the specified number of elements from a source array to a receiving one starting from a specified index
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ArrayRemove
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Removes the specified number of elements from the array starting with a specified index
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ArrayReverse
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Reverses the specified number of elements in the array starting with a specified index
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ArraySetAsSeries
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Sets the direction of array indexing
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ArraySize
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Returns the number of elements in the array
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ArraySort
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Sorting of numeric arrays by the first dimension
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ArraySwap
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Swaps the contents of two dynamic arrays of the same type
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