Remove rows from a 2d array if value in column is empty - excel

Question

I have a large table of lab measurement logs, which I work with using arrays.
(Im a chemist, a lab technician and Ive started to learn VBA only last week, please bear with me.)
Im trying to figure out, how to load the table into an array and then remove rows with an empty value in the 5th column so that I can "export" the table without blanks in the 5th column via an array into a different sheet.
I first tested this with some code I found for a 1D array, where I would make 2 arrays, one placeholder array which Id loop through adding only non-blanks to a second array.
For Counter = LBound(TestArr) To UBound(TestArr)
If TestArr(Counter, 1) <> "" Then
NoBlankSize = NoBlankSize + 1
NoBlanksArr(UBound(NoBlanksArr)) = TestArr(Counter, 1)
ReDim Preserve NoBlanksArr(0 To UBound(NoBlanksArr) + 1)
End If
Next Counter
It works in 1D, but I cant seem to get it two work with 2 dimensions.
Heres the array Im using for reading and outputting the data
Sub ArrayTest()
Application.ScreenUpdating = False
Application.Calculation = xlCalculationManual
Dim TestArray() As Variant
Dim Dimension1 As Long, Dimension2 As Long
Sheets("Tracker").Activate
Dimension1 = Range("A3", Range("A2").End(xlDown)).Cells.Count - 1
Dimension2 = Range("A2", Range("A2").End(xlToRight)).Cells.Count - 1
ReDim TestArray(0 To Dimension1, 0 To Dimension2)
'load into array
For Dimension1 = LBound(TestArray, 1) To UBound(TestArray, 1)
For Dimension2 = LBound(TestArray, 2) To UBound(TestArray, 2)
TestArray(Dimension1, Dimension2) = Range("A4").Offset(Dimension1, Dimension2).Value
Next Dimension2
Next Dimension1
Sheets("Output").Activate
ActiveSheet.Range("A2").Select
'read from array
For Dimension1 = LBound(TestArray, 1) To UBound(TestArray, 1)
For Dimension2 = LBound(TestArray, 2) To UBound(TestArray, 2)
ActiveCell.Offset(Dimension1, Dimension2).Value = TestArray(Dimension1, Dimension2)
Next Dimension2
Next Dimension1
Erase TestArray
Application.ScreenUpdating = True
Application.Calculation = xlCalculationAutomatic
End Sub
Thank you for any help in advance.

Answer 1

The Redim Preserve statement does not work for two-dimensional arrays if you want to change the number of records (rows).
You could load the range into an array, and then when you want to export the array to another range, loop through that array while skipping blank records.
An example:
Option Explicit
Sub ArrayTest()
Dim wb As Workbook, wsInput As Worksheet, wsOutput As Worksheet
Dim myArr As Variant
Dim i As Long, k As Long, LRow As Long
Set wb = ThisWorkbook
Set wsInput = wb.Sheets("Tracker")
Set wsOutput = wb.Sheets("Output")
LRow = wsOutput.Cells(wsOutput.Rows.Count, "A").End(xlUp).Row + 1
'Load a range into the array (example range)
myArr = wsInput.Range("A1:Z100")
'Fill another range with the array
For i = LBound(myArr) To UBound(myArr)
'Check if the first field of the current record is empty
If Not Len(myArr(i, 1)) = 0 Then
'Loop through the record and fill the row
For k = LBound(myArr, 2) To UBound(myArr, 2)
wsOutput.Cells(LRow, k) = myArr(i, k)
Next k
LRow = LRow + 1
End If
Next i
End Sub

Answer 2

From your code, it appears you want to
test a column of data on a worksheet to see if there are blanks.
if there are blanks in the particular column, exclude that row
copy the data with the excluded rows to a new area
You can probably do that easier (and quicker) with a filter: code below checking for blanks in column2
Option Explicit
Sub removeCol2BlankRows()
Dim wsSrc As Worksheet, wsRes As Worksheet
Dim rSrc As Range, rRes As Range
Set wsSrc = ThisWorkbook.Worksheets("sheet1")
Set rSrc = wsSrc.Cells(1, 1).CurrentRegion 'many ways to do this
Set wsRes = ThisWorkbook.Worksheets("sheet1")
Set rRes = wsRes.Cells(1, 10)
If wsSrc.AutoFilterMode = True Then wsSrc.AutoFilterMode = False
rSrc.AutoFilter field:=2, Criteria1:="<>"
rSrc.SpecialCells(xlCellTypeVisible).Copy rRes
wsRes.AutoFilterMode = False
End Sub
If you really just want to filter the VBA arrays in code, I'd store the non-blank rows in a dictionary, and then write it back to the new array:
Option Explicit
Sub removeCol2BlankRows()
Dim testArr As Variant
Dim noBlanksArr As Variant
Dim myDict As Object
Dim I As Long, J As Long, V
Dim rwData(1 To 4) As Variant
With ThisWorkbook.Worksheets("sheet1")
testArr = .Range(.Cells(1, 1), .Cells(.Rows.Count, 1).End(xlUp)).Resize(columnsize:=4)
End With
Set myDict = CreateObject("Scripting.Dictionary")
For I = 1 To UBound(testArr, 1)
If testArr(I, 2) <> "" Then
For J = 1 To UBound(testArr, 2)
rwData(J) = testArr(I, J)
Next J
myDict.Add Key:=I, Item:=rwData
End If
Next I
ReDim noBlanksArr(1 To myDict.Count, 1 To 4)
I = 0
For Each V In myDict.keys
I = I + 1
For J = 1 To 4
noBlanksArr(I, J) = myDict(V)(J)
Next J
Next V
End Sub