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Excel RANDARRAY Function

Excel RANDARRAY function
Summary 

The Excel RANDARRAY function returns an array of random numbers between 0 and 1. The size or the array is determined by rows and columns arguments.

Purpose 
Get array of random numbers
Return value 
Array of random values
Syntax 
=RANDARRAY ([rows], [columns], [min], [max], [integer])
Arguments 
  • rows - [optional] Number of rows to return. Default = 1.
  • columns - [optional] Number of columns to return. Default = 1.
  • min - [optional] Minimum value to return. Default = 0.
  • max - [optional] Maximum value to return. Default = 1.
  • integer - [optional] Return whole numbers. Boolean, TRUE or FALSE. Default = FALSE.
Usage notes 

The RANDARRAY function is a "Dynamic array function". RANDARRAY returns an array of random numbers between 0 and 1. The size or the array is determined by rows and columns arguments. When RANDARRAY returns multiple results in a worksheet, results will spill into adjacent cells.

Example #1

In the example shown, RANDARRAY is used to generate 50 values in a range10 rows by 5 columns. The formula in B4 is:

=RANDARRAY(10,5)

Example #2

To return a random array of integers, 5 rows by 2 columns,  between 1 and 10, you can use a formula like this:

=RANDARRAY(5,2,1,10,TRUE)
Note: The RANDARRAY function is a new "Dynamic Array Function" in Excel. It is a beta feature available only through the Office Insiders program. Dynamic Array functions are expected to be released in 2019 to Office 365 subscribers.
Related functions 
Excel UNIQUE function
Excel UNIQUE Function
The Excel UNIQUE function returns a list of unique values in a list or range. Values can be text, numbers, dates, times, etc.
Excel SORT function
Excel SORT Function

The Excel SORT function sorts the contents of a range or array. Values can be sorted by one or more columns. SORT returns a dynamic array of results.

Excel SORTBY function
Excel SORTBY Function
The Excel SORTBY function sorts the contents of a range or array based on the values from another range or array. The range or array used to sort does not need to appear in results.
Excel FILTER function
Excel FILTER Function

The Excel FILTER function filters a range of data based on supplied criteria, and extracts matching records.

Excel SEQUENCE function
Excel SEQUENCE Function

The Excel SEQUENCE function generates a list of sequential numbers in an array. The array can be one dimensional, or two-dimensional. Start and step values are arguments.

Excel RANDARRAY function
Excel RANDARRAY Function

The Excel RANDARRAY function returns an array of random numbers between 0 and 1. The size or the array is determined by rows and columns arguments.

Excel SINGLE function
Excel SINGLE Function
The Excel SINGLE function returns a single value using implicit intersection. The SINGLE function is provided for backwards compatibility with implicit intersection formulas in earlier versions of Excel.
Good links 
Microsoft RANDARRAY function documentation

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