Excel MAXIF function or emulation?

Question

I have a moderately sized dataset in excel from which I wish to extract the maximum value of the values in Column B, but those that correspond only to cells in Column A that

Answer 1

Array formulas don't work very well when you want to use dynamic or named ranges (e.g., "the maximum amount due for rows above the current row that have the same counterparty as the current row). If you don't want to use an array formula, you can always resort to VBA to do something like this:

Function maxIfs(maxRange As Range, criteriaRange As Range, criterion As Variant) As Variant

  maxIfs = Empty
  For i = 1 To maxRange.Cells.Count
    If criteriaRange.Cells(i).Value = criterion Then
        If maxIfs = Empty Then
            maxIfs = maxRange.Cells(i).Value
        Else
            maxIfs = Application.WorksheetFunction.Max(maxIfs, maxRange.Cells(i).Value)
        End If
    End If
  Next
End Function