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This Custom Function will sum every nth row or cell in the
specified range. How about a free
Function SumEveryNth2007(rRange As Range, lNth As Long, Optional SumEveryNthRow As Boolean) As Single Dim rCell As Range Dim strAddress As String ''''''''''''''''''''''''''''''''''''''''' 'Written by Ozgrid.com''''''''''''''''''' 'Sums every nth cell. 'If more than 1 column, summation order is left-to-right and top-to-bottom 'unless SumEveryNthRow=TRUE 'Function very inefficient, rRange should be as small as possible. 'Most efficient method is DSUM, shown here 'http://www.ozgrid.com/Excel/sum-every-2nd-nth-cell.htm ''''''''''''''''''''''''''''''''''''''''' On Error Resume Next If SumEveryNthRow = False Then With WorksheetFunction For Each rCell In rRange lStep = lStep + 1 If lStep Mod lNth = 0 Then sTot = .Sum(rCell, sTot) Next rCell End With SumEveryNth2007 = sTot Else strAddress = rRange.Address SumEveryNth2007 = Evaluate("=SUMPRODUCT((MOD(ROW(" & strAddress & ")," & lNth & ")=0)*(" & strAddress & "))") End If End Function
To use this UDF push Alt+F11 and go Insert>Module and paste in the code. Push Alt+Q and save. The Function will appear under "User Defined" in the Paste Function dialog box (Shift+F3). Use the Function in any cell as shown below.
This would sum every 2nd cell in the range $A$1:$A$10
This would sum every 2nd row in the range $A$1:$B$10
See Also: Excel Duplication Manager Add-in | Excel Number Manager Add-in | Excel Text Manager Add-in | Excel Named Range Add-in Manager | Excel OzGrid Plus Add-in | Excel Time Sheet | Excel Time Wage and Pay book
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