Cannot place a value in a cell other than the cell (or range) containing the formula.If you call another function or macro from a UDF, the other macro is under the same limitations as the UDF.UDF's cannot alter the structure or format of a worksheet or cell. Cannot 'record' an Excel UDF like you can an Excel macro.Date calculations prior to 1900 using the built-in VBA date functions.Advanced array formulas and matrix functions.Diagnostics such as checking cell formats.Simplify formulas that would otherwise be extremely long 'mega formulas'.

Create a complex or custom math function.If they don't have your add-in, the functions will not work when they use the spreadsheet. Warning! Be careful about using custom functions in spreadsheets that you need to share with others. for Excel 2003 or Developer > Excel Add-Ins for Excel 2010+). To create an add-in, save your excel file that contains your VBA functions as an add-in file (. If you want to use a UDF in more than one workbook, you can save your functions to your personal.xlsb workbook or save them in your own custom add-in. Use the functions - They will appear in the Paste Function dialog box ( Shift+F3) under the 'User Defined' category.Copy and Paste the Excel user defined function examples.How to Create a Custom User Defined Function

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