Find row indices of empty cells in a given range - excel

Question

Is it possible to write a vba macro that determines if there are any empty cells in a given range and returns the row number of that cell?
I'm new to vba and all that I managed to write after searching the internet was something that takes a range and colors every emty cell in it red:
Sub EmptyRed()
If TypeName(Selection) <> "Range" Then Exit Sub
For Each cell In Selection
If IsEmpty(cell.Value) Then cell.Interior.Color = RGB(255, 0, 0)
Next cell
End Sub
The macro does basically what I want, but instead of coloring the empty cell red I would like to know the row index of the empty cell.
A little background info: I have a very large file (about 80 000 rows) that contains many merged cells. I want to import it into R with readxl. Readxl splits merged cells, puts the value in the first split cell and NA into all others. But a completely empty cell would also be assigned NA, so I thought the best thing would be to find out which cells are empty with Excel, so that I know which NA indicate a merged cell or an empty cell. Any suggestions on how to solve this problem are very welcome, thanks!
Edit: To clarify: Ideally, I want to unmerge all cells in my document and fill each split cell with the content of the previously merged cell. But I found macros on the web that are supposed to do exactly that, but they didn't work on my file, so I thought I could just determine blank cells and then work on them in R. I usually don't work with Excel so I know very little about it, so sorry if my thought process is far too complicated.

Answer 1

To do exactly what you state in your title:
If IsEmpty(cell.Value) Then Debug.Print cell.Row
But there are also Excel methods to determine merged cells and act on them. So And I'm not sure exactly what you want to do with the information.
EDIT
Adding on what you say you want to do with the results, perhaps this VBA code might help:
Option Explicit
Sub EmptyRed()
Dim myMergedRange As Range, myCell As Range, myMergedCell As Range
Dim rngProcess As Range
With Application
.ScreenUpdating = False
.Calculation = xlCalculationManual
.EnableEvents = False
End With
Set rngProcess = Range("A1:B10")
For Each myCell In rngProcess
If myCell.MergeCells = True Then
Set myMergedRange = myCell.MergeArea
With myMergedRange
.MergeCells = False
.Value = myCell(1, 1)
End With
End If
Next myCell
With Application
.ScreenUpdating = True
.Calculation = xlCalculationAutomatic
.EnableEvents = True
End With
End sub
Note that I explicitly declare all variables, and I hard coded the range to check. There are various ways of declaring the range to be checked; using 'Selection' is usually rarely preferred.

Answer 2

Before anything else: From the opposite end of the spectrum, you can use Range.MergeCells or Range.MergeArea to determine if a Cell is part of a Merged Area. But, I digress...
You can use Cell.Row to get the row number. How you return or display that is up to you - could be a Message Box, a delimited string, or an array, or even a multi-area range.
A Sub cannot return anything once called, so you may want a Function instead, e.g. Public Function EmptyRed() As String
(Also, I would recommend you get in the habit of explicitly declaring all of your variables, and perhaps using Option Explicit too, before you run into a typo-based error. Just add Dim cell As Range at the top of the sub for now)

Answer 3

Sub FF()
Dim r, wksOutput As Worksheet
Dim cell As Range, rng As Range, rngArea As Range
With Selection
.UnMerge
'// Get only blank cells
Set rng = .SpecialCells(xlCellTypeBlanks)
'// Make blank cells red
rng.Interior.Color = vbRed
End With
'// Create output worksheet
Set wksOutput = Sheets.Add()
With wksOutput
For Each rngArea In rng.Areas
For Each cell In rngArea
r = r + 1
'// Write down the row of blank cell
.Cells(r, 1) = cell.Row
Next
Next
'// Remove duplicates
.Range("A:A").RemoveDuplicates Array(1), xlNo
End With
End Sub

Answer 4

There are a couple ways:
Sub EmptyRed()
Dim rgn,targetrgn as range
Dim ads as string ‘ return rgn address
Set targetrgn= ‘ your selection
For Each rgn In Targetrgn
If IsEmpty(rgn.Value) Then
‘1. Use address function, and from there you can stripe out the column and row
Ads=application.worksheetfunction.addres(cell,1)’ the second input control the address format, w/o $
‘2. Range.row & range.column
Ads=“row:” & rgn.row & “, col: “ & rgn.column
End if
Next rgn
End Sub
Ps: I edited the code on my phone and will debug further when I have a computer. And I am just more used to use “range” rather than “cell”.

Answer 5

To clarify: Ideally, I want to unmerge all cells in my document and fill each split cell with the content of the previously merged cell.
Cycle through all cells in the worksheet's UsedRange
If merged, unmerge and fill the unmerged area with the value from the formerly merged area.
If not merged but blank, collect for address output.
Sub fillMerged()
Dim r As Range, br As Range, mr As Range
For Each r In ActiveSheet.UsedRange
If r.Address <> r.MergeArea.Address Then
'merged cells - unmerge and set value to all
Set mr = r.MergeArea
r.UnMerge
mr.Value = mr.Cells(1).Value
ElseIf IsEmpty(r) Then
'unmerged blank cell
If br Is Nothing Then
Set br = r
Else
Set br = Union(br, r)
End If
End If
Next r
Debug.Print "blank cells: " & br.Address(0, 0)
End Sub