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The Excel DELTA Function
Related Function:
GESTEP FunctionBasic Description
The Excel Delta function tests two numbers for equality and returns the Kronecker Delta. i.e. the function returns 1 if the two supplied numbers are equal and 0 otherwise.
The syntax of the function is :
DELTA( number1, [number2] )
where number1 and [number2] are the two numbers to be compared. The [number2] argument is optional, and if omitted, takes on the value 0.
Delta Function Examples
four examples of the Excel Delta function are shown in the spreadsheets below.
The spreadsheet on the left shows the formulas and the spreadsheet on the left shows the Delta function results.
Formulas:  Results: 
Note that, in cell A4 the above example spreadsheet, second argument, [number2], is omitted from the function. This function therefore compares the supplied value with zero.
Further examples of the Excel Delta function can be found on the Microsoft Office website.
Delta Function Errors
If you get an error from the Excel Delta function this is likely to be one of the following :
Common Errors
#VALUE!    Occurs if any of the supplied number arguments are not numeric 
#NAME?    Occurs when Analysis ToolPak addin is not enabled in your Excel. You will need to enable the addin if you want to use the Excel engineering functions.
+ Show How to Do This in Excel 2003:
 From the Tools dropdown menu, select the option AddIns ...
 An 'AddIns' window will pop up. From this, select the option Analysis ToolPak and click OK
+ Show How to Do This in Excel 2007:
 Click the Microsoft button on the top left of your spreadsheet and select
the Excel Options button
 From the menu on the left hand side, select AddIns
 In the 'Manage:' box, select Excel Addins and click Go...
 An 'AddIns' window will pop up. From this, select the option Analysis ToolPak and click OK
+ Show How to Do This in Excel 2010 or Excel 2013:
 Click the File tab (top left of your spreadsheet) and select Options
 From the menu on the left hand side, select AddIns
 If the window that pops up doesn't show the 'Addins' list, use the 'Manage:'
dropdown menu (at the bottom of the window) to select Excel Addins. Click Go...
 From the 'AddIns' window, select the option Analysis ToolPak and click OK
