## Find positive and negative amounts that net to zero [UDF]

This article describes a UDF that finds positive and negative numbers that net to approximately zero. You specify the range around 0 (zero).

I created/modified an udf to solve his question: Find positive and negative amounts that net to zero in excel

**Question**:I would like to reduce the number of open items by identifying positive and negative amounts that net to zero and clear those items

Criteria:

- Minimze the number of open items
- include as many transactions as possible
- net as close to zero as possible

**Udf (array) in cell range c23:V55:**

The udf processes these 20 numbers in around 30 seconds. There are 18 numbers found in row 24 and also in row 25 and 31.

Formula in column W sums values in each particular row.

Formula in column X counts values.

**How to use user defined function in excel**

- Press Alt-F11 to open visual basic editor
- Click Module on the Insert menu
- Copy and paste the belowuser defined function
- Exit visual basic editor

### Download excel sample file for this tutorial.

Find amounts netting to zero.xls

(Excel 97-2003 Workbook *.xls)

VBA code

Function Find_num(rng As Range, cell As Range, num_range As Single) Dim com() As Single, c As Single, i As Single Dim s As Single, d As Single, u As Single, v As Single Dim arr() As String, r As Single, p As Single, t As Single Dim sum_cells As Single, j As Single, k As Single, l As Single sum_cells = Application.WorksheetFunction.Sum(rng) c = rng.Rows.Count ReDim arr(1 To 10000, 1 To c) r = 1 For i = 0 To Int(c / 2) If i <> Int(c / 2) - 1 Then t = WorksheetFunction.Combin(c, i + 1) Else t = WorksheetFunction.Combin(c, i + 1) / 2 End If ReDim com(i) For j = 0 To i com(j) = j + 1 Next k = i For s = 1 To t If com(k) > c And i > 0 Then p = 0 Do Until com(k) <= c - p com(k - 1) = com(k - 1) + 1 k = k - 1 p = p + 1 Loop Do Until k >= i k = k + 1 com(k) = com(k - 1) + 1 Loop End If d = 0 For j = 0 To i d = d + rng(com(j)) Next j If d <= cell + num_range And d >= cell - num_range Then For j = 1 To i + 1 arr(r, j) = rng(com(j - 1)) Next j r = r + 1 End If If sum_cells - d <= cell + num_range And sum_cells - d >= cell - num_range Then For j = 1 To c v = 0 For u = 0 To i If rng(com(u)) = rng(j) Then v = 1 Next u If v = 0 Then arr(r, j) = rng(j) End If Next j r = r + 1 End If com(k) = com(k) + 1 Next s Next i Find_num = arr() End Function

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### 5 Responses to “Find positive and negative amounts that net to zero [UDF]”

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Thanks for covering this topic (I've been looking for something like this for six months and had just about given up hope). Unfortunately, I'm having implementing it. Am I just supposed to have my amounts entered in column B, and then only to follow the "How to use user defined function in Excel", or do I have to also enter the formulas also. If so, in what cell do I enter =FIND_num(B2:B21, E21,5) + CTRL + SHIFT + ENTER ? Do I also need to enter any formulas in any other cells (if so, what do I enter and which cell(s) do I enter it. Thanks!

Mike,

You enter the =FIND_num(B2:B21, E21,5) in your cell range.

Example

1. Select your cell range (C23:V55 in the example above)

2. Paste user defined function the in formula bar

3. Press and hold Ctrl + Shift

4. Press Enter

=Find_num(cellrange, sum, range)

See the explaining picture above.

Thanks for the quick response, Oscar. I pressed alt-F11 to open vba editor, clicked Module on the Insert menu, copy and pasted the udf, exited vba editor, selected cell range of C23:V55, pasted the udf function in the formla bar, pressed and held Ctrl + Shift, and pressed enter. The function ran (which was very exciting!) and the results showed in columns C24 thru V55, but there weren't any results in column W or X. Please advise. Thanks.

Mike,

I added formulas in colummns W and X to show that the sum is in the specified range (-5 to 5) and how many numbers were found.

=FIND_num(B2:B21, E21, 5)

B2:B21 - Numbers

Cell E21 contains the sum value

5 is the range

Hello Oscar,

it is great tool you presented. I need to search inbetween of plenty items (1000 and more lines) I tried to exted formulas and matrix in file however when I try with more than 25 items I receive #VALUE error as an example. Do you have any idea what that is?

Thank you in advance for help.