At least, it becomes so when you understand the breadth of built-in functions in VBA. ' the function name as the return variable.Īside from the fact that all this parsing isn’t really necessary because the problem is much simpler and cleaner.
' Return a value from a User Defined Function (UDF) by using ' Initialize local variables and parse the month from the left. NewSerialDate = DateSerial(year, month, day) ' Return a value from a User Defined Function (UDF) by using ' the function name as the return variable. ' Shift the start position and parse the day from the middle.ĭay = Mid(dateIn, startPosition, endPosition - startPosition) ' This is a debugging tool to track variables during execution. Dim day As String Dim month As String Dim year As String Dim startPosition As Integer Dim endPosition As Integer Dim length As Integer ' Initialize local variables and parse the month from the left.ĮndPosition = InStr(startPosition, dateIn, "/") The name of the library will be the same as the Workbook where you created it.
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They show you how to display the developer ribbon, open a module for editing, save VBA code into a library ( *.xlam file), and add the library file as an “Add-in” library to your Excel 2007 installation. Here are the steps to configure your Excel 2007 environment to work with Visual Basic for Applications (VBA) and UDFs.
That having been said, they can dramatically hide the complexity of mega-formulas and remove them from the editing control of users. You can’t access other cells in a workbook, and may only return a value (also known as an expression) to the cell that uses the formula. Microsoft Excel User Defined Functions (UDFs) are different than standard VBA macros. This is a quick tutorial, mostly for my students, but as usual for anybody who’s interested. Library functions are less risky than macros because they must return a value to a cell. Microsoft Excel supports macros but it also supports library functions, known as User Defined Functions (UDF).
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