Microsoft KB Archive/213826

= XL2000: Visual Basic Macro to List Circular References =

Article ID: 213826

Article Last Modified on 11/23/2006

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APPLIES TO


 * Microsoft Excel 2000 Standard Edition

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This article was previously published under Q213826





SUMMARY
In a Microsoft Excel 2000 worksheet, when a formula in a cell refers to the same cell the formula occupies, either directly or indirectly, a circular reference is created. In Excel 2000, tracing tools are provided on the Auditing toolbar to help you locate unwanted circular references. Another way you can trace circular references is to create a Microsoft Visual Basic for Applications macro that produces a list of all cells containing circular references that occur in a single worksheet.



MORE INFORMATION
Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact a Microsoft Certified Partner or the Microsoft fee-based consulting line at (800) 936-5200. For more information about Microsoft Certified Partners, please visit the following Microsoft Web site:

https://partner.microsoft.com/global/30000104

For more information about the support options that are available and about how to contact Microsoft, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

Finding Circular References
Precedents are the cells referenced, directly or indirectly, by a formula. A circular reference occurs whenever the cell containing the circular reference formula is included in the formula's precedents.

The following sample Visual Basic macro generates a new sheet in a workbook and lists all circular references found on the active worksheet. The macro does this by testing each formula in the sheet to see if the cell containing the formula intersects the precedents of the formula.

NOTE: A limitation of this method is that the Precedents property in Visual Basic for Applications can only find precedents on the active sheet. The macro will not find a circular reference that is caused by a remote reference.

Sample Visual Basic Procedure
On a module sheet, enter the following Visual Basic code: Sub FindCircRefs ' Get source information. sourcesheet = ActiveSheet.Name Sheets.Add ' Get destination information. destsheet = ActiveSheet.Name destrange = ActiveCell.Address ' Return to source. Worksheets(sourcesheet).Activate rowcount = 0 ' Trap for error in "result", indicating no circular reference. On Error GoTo notcircular

' Loop through every used cell in source. For Each Item In ActiveSheet.UsedRange ' Check to see if cell contains a formula. If Left(Item.Formula, 1) = "=" Then ' If cell intersects with precedents, cell has circular ' reference. result = Intersect(ActiveSheet.Range(Item.Address), _               ActiveSheet.Range(Item.Precedents.Address))

Worksheets(destsheet).Range(destrange).Offset(rowcount, _               0).Value = Item.Address(False, False)

Worksheets(destsheet).Range(destrange).Offset(rowcount, _               1).Value = "'" & Item.Formula

rowcount = rowcount + 1 ' Skip to here if not circular. skipitem: End If   Next Exit Sub

' If error in "result", go here. notcircular: ' Skip cells that do not contain circular references. Resume skipitem End Sub To use this macro, run the FindCircRefs macro from the Microsoft Excel worksheet for which you want to find circular references. A new sheet is added to the active workbook, listing the cell addresses of circular references in column A and the formula at that address in column B. If no circular references are found, the new sheet is empty.

