VBA: adding up irregular ranges - vba

Question

I need some help to create a macro which adds all the values on the column E between the rows with the "avg" word. the result should be displayed on the cells where the "Sum here" label is displayed. Both texts "avg" and "sum here" is just for illustrate the example, "avg" could be replaced by any other word and "sum here" should actually be the aggregation of the values above it.
The real challenge is that the number of ranges on column E is variable, so i would like to find a macro which is able to deal with "n" number of ranges on column E.
Finally, the values on column D are only the example of the expected value on the "sum here" cells.
This is what I have tried to far:
Sub Macro1()
'
' Macro1 Macro
'
Dim sumhere As Range
Dim startingpoint As Range
Dim endingpoint As Range
'
Range("C17").Select
Selection.End(xlDown).Select
If ActiveCell = "avg" Then
ActiveCell.Offset(rowoffset:=0, columnoffset:=2).Select
Set sumhere = ActiveCell
Set startingpoint = ActiveCell.Offset(rowoffset:=-1, columnoffset:=0)
Selection.End(xlUp).Select
If (ActiveCell.Value) = "Sum here" Then
Set endingpoint = ActiveCell.Offset(rowoffset:=1, columnoffset:=0)
sumhere.Formula = "=sum(range(startingpoint:endingpoint)"
Else
Selection.End(xlUp).Select
If (ActiveCell.Value) = "Sum here" Then
Set endingpoint = ActiveCell.Offset(rowoffset:=1, columnoffset:=0)
sumhere.Formula = "=Sum(Range(startingpoint.adress:endingpoint.adress))"
Else: End If
End If
End If
End Sub
Additionally, as you can see, I do not know, how to define a range using variables. My original idea was to combine this code with some kind of "do while" or/and "for i= 1 to x" and "next i". But I can't see how to combine it.

Answer 1

Using formula only, and providing that column A only has avg (or any text) on each subtotal row.
I've given two versions of the formula - the volatile version (updates everytime you change anything on the spreadsheet), and the non-volatile version (only updates if it needs to).
The formula should be entered on row 6 - change the $E6 to which ever row you need.
(volatile)
=SUM(OFFSET($E6,IFERROR(LOOKUP(2,1/($A$1:INDEX($A:$A,ROW()-1)<>""),ROW($A$1:INDEX($A:$A,ROW()-1))),0)-ROW()+1,,ROW()-1-IFERROR(LOOKUP(2,1/($A$1:INDEX($A:$A,ROW()-1)<>""),ROW($A$1:INDEX($A:$A,ROW()-1))),0)))
(non volatile):
=SUM(INDEX($E:$E,IFERROR(LOOKUP(2,1/($A$1:INDEX($A:$A,ROW()-1)<>""),ROW($A$1:INDEX($A:$A,ROW()-1))),0)+1):INDEX($E:$E,ROW()-1))
or if you don't mind using a helper column:
In cell B6:
=IFERROR(LOOKUP(2,1/($A$1:INDEX($A:$A,ROW()-1)<>""),ROW($A$1:INDEX($A:$A,ROW()-1))),0)
In E6: (volatile)
=SUM(OFFSET($E6,$B6-ROW()+1,,ROW()-1-$B6))
or (non volatile):
=SUM(INDEX($E:$E,$B6):INDEX($E:$E,ROW()-1))
Edit:
Thought I'd add a UDF to calculate it to if you're after VBA.
Use the function =AddSubTotal() in the rows you want the sub total to be shown in, or use =AddSubTotal("pop",6) to sum everything in column F (col 6) using "pop" rather than "avg".
Public Function AddSubTotal(Optional Delim As String = "avg", Optional ColNumber = 5) As Double
Dim rCaller As Range
Dim rPrevious As Range
Dim rSumRange As Range
Set rCaller = Application.Caller
With rCaller.Parent
Set rPrevious = .Range(.Cells(1, 1), .Cells(rCaller.Row - 1, 1)).Find(Delim, , , , , xlPrevious)
If Not rPrevious Is Nothing Then
Set rSumRange = rPrevious.Offset(1, ColNumber - 1).Resize(rCaller.Row - rPrevious.Row - 1)
Else
Set rSumRange = .Range(.Cells(1, ColNumber), .Cells(rCaller.Row - 1, ColNumber))
End If
End With
AddSubTotal = WorksheetFunction.Sum(rSumRange)
End Function

Answer 2

The following VBA routine assumes that
your data is in Columns C:E
Nothing else relevant (nothing numeric) in that range
Your "key word" where you want to show the sum is avg
avg (the key word) is hard-coded in the macro
You could easily modify this routine to also perform an average of those values, and put those results, for example, in Column D
Any of the above are easily modified
Option Explicit
Sub TotalSubRanges()
Dim vSrc As Variant, rSrc As Range
Dim dAdd As Double
Dim I As Long
Const sKey As String = "avg"
Set rSrc = Range(Cells(1, "C"), Cells(Rows.Count, "C").End(xlUp)).Resize(columnsize:=3)
vSrc = rSrc
'Do the "work" in a VBA array, as this will
' execute much faster than working directly
' on the worksheet
For I = 1 To UBound(vSrc, 1)
If vSrc(I, 1) = sKey Then
vSrc(I, 3) = dAdd
dAdd = 0
Else
If IsNumeric(vSrc(I, 3)) Then dAdd = dAdd + vSrc(I, 3)
End If
Next I
'write the results back to the worksheet
' and conditionally format the "sum" cells
With rSrc
.EntireColumn.Clear
.Value = vSrc
.Columns(3).AutoFit
.EntireColumn.ColumnWidth = .Columns(3).ColumnWidth
.FormatConditions.Delete
.FormatConditions.Add _
Type:=xlExpression, _
Formula1:="=" & .Item(1, 1).Address(False, True) & "=""" & sKey & """"
With .FormatConditions(1)
.Interior.ColorIndex = 6
End With
End With
End Sub

Answer 3

Surely you just need something like:
Sub sums()
Dim i As Integer, j As Integer, k As Integer
j = Range("C1048576").End(xlUp).Row
k = 1
For i = 1 To j
If Range("C" & i).Value <> "" Then
Range("E" & i).Value = "=Sum(E" & k & ":E" & i - 1 & ")"
k = i + 1
End If
Next i
End Sub

Answer 4

Change:
Dim startingpoint As Range
Dim endingpoint As Range
To:
Dim startingpoint As Variant
Dim endingpoint As Variant
As the startingpoint and endingpoint is used in a formula, you cant define them as a Range.