Inserting new row in excel by VBA - excel

Question

I have an excel spreadsheet. In a column of the spreadsheet I have a list of codes (numbers).These codes (numbers) are sorted from highest to lowest values.(some of these codes has been repeated. For example I have three consecutive line with code 1001200).I want to insert new rows between each codes (in case of having repeated codes i just need one new row (for example i Just need one new row for 1001200 not 3 rows) .
I have written the following code but it does not work.
Sub addspace()
Dim space_1(5000), Space_2(5000)
For n = 1 To 5000
Debug.Print space_1(n) = Worksheets("sheet3").Cells(1 + n, 1).Value
Debug.Print Space_2(n) = Worksheets("sheet3").Cells(2 + n, 1).Value
Next
For n = 1 To 5000
If space_1(n) <> Space_2(n) Then
Range("space_1(n)").EntireRow.Insert
End If
Next
End Sub
How can I fix it? (From the code you can see that I am so beginner :)))
Cheers

Answer 1

To insert one empty row between each unique value try this:
Option Explicit
Public Sub addspace()
Dim i As Long
Application.ScreenUpdating = False
With Worksheets("sheet3")
For i = 5000 To 2 Step -1
While .Range("A" & i - 1) = .Range("A" & i)
i = i - 1
Wend
.Rows(i).Insert Shift:=xlDown
Next
End With
Application.ScreenUpdating = True
End Sub
It starts from the end row and moves up, skipping duplicates

Answer 2

The Range("space_1(n)") is invalid. Arg of range object should be a column name like "A1", you can use Range("A" & n).EntireRow.Insert in your code. But I recommend my code.
Please try,
Sub addspace()
Dim n As Integer
For n = 1 To 5000
If Worksheets("sheet3").Cells(n, 1).Value <> Worksheets("sheet3").Cells(n + 1, 1).Value Then
Worksheets("sheet3").Cells(n + 1, 1).EntireRow.Insert
n = n + 1
End If
Next
End Sub