Multidimensional array or collection - arrays

I have code:
Dim products As Variant
LastRow = ActiveSheet.Cells(Rows.Count, 1).End(xlUp).Row
products = Array("MS-CHOPMAT-6", "MS-BOARDS-3", "MS-CHOP-LR")
For x = LastRow To 1 Step -1
order_quantity = Range("$E$" & x).Value
item_price = Range("$F$" & x).Value
' if value not found inside the array using the "MATCH" function
If IsError(Application.Match(Range("$D$" & x).Value, products, 0)) Then
Range("$H$" & x).Value = "ERROR - " & order_quantity
Else ' successful "MATCH" inside the array
Range("$H$" & x).Value = order_quantity * 3
End If
Next
but instead of having simple array I need array multidimensional or "collections". How to change this code to work with collections or multidimensional array
like:
products = Array(Array("MS-CHOPMAT-6", 11,"w"), Array("MS-BOARDS-3", 12, 4), Array("MS-CHOP-LR", 13, 5))

The two dimensional answer to this would be as below. There are many way to do this, this is simply an example. Two dimensional arrays are great but need some thought around implementation, ideally you would want to use some form of recursion to populate it, the example below simple sets them in a static manner.
Public Sub Sample()
Dim AryTable() As String
Dim LngRow As Long
Dim LngCol As Long
'Below is a two dimensional array, think of it as a
'table with 3 rows and 5 columns (the base is zero
'so it is not 2 rows and 4 columns as it may look)
ReDim AryTable(2, 4)
'We can then populate (or not) each 'cell' of the array
'Row 1
AryTable(0, 0) = "1"
AryTable(0, 1) = "Field1"
AryTable(0, 2) = "Field2"
AryTable(0, 3) = "Field3"
'Row 2
AryTable(1, 0) = "2"
AryTable(1, 1) = "Field1"
AryTable(1, 2) = "Field2"
AryTable(1, 3) = "Field3"
AryTable(1, 4) = "Field4"
'Row 3
AryTable(2, 0) = "3"
AryTable(2, 1) = "Field1"
AryTable(2, 2) = "Field2"
AryTable(2, 4) = "Field4"
'Ubound by the first dimension to go through the rows
For LngRow = 0 To UBound(AryTable, 1)
'Ubound by the second dimension to go through the columns
For LngCol = 0 To UBound(AryTable, 2)
Debug.Print AryTable(LngRow, 0) & ": " & AryTable(LngRow, LngCol)
Next
Next
End Sub
Point to note, if you don't declare the size of the array at the start you can change it later.
This is declared (and can not be changed later): -
Dim AryTable(1,2) as string
This is not declared (and can be changed later): -
Dim AryTable() as string
When yo have not declared its size (so can change it) you must size it before use. There are two ways to do it, reset or preserve.
This will clear the array and set it to the new size, I.e. If the array was previously 100 in size and had data it in, the below would remove all the data but make it larger.
Redim AryTable(200)
If the array was previously 100 in size and had data it in, the below would retain all the data and make it larger
Redim Preserve AryTable(200)
On a two dimensional array you can only adjust the second dimension. The below is ok: -
Redim AryTable(2,4)
Redim Preserve AryTable(2,8)
The below will fail: -
Redim AryTable(2,4)
Redim Preserve AryTable(4,8)
With this in mind if you want to use a two dimensional array to store data like a table, use the first dimension to be columns and the second to be the rows, columns counts rarely change but row may be added.

This may help, an array in an array is not strictly possible, what you can do what I have done in the past is mimic an array in an array action by creating your own delimiter as shown below.
Public Sub Sample()
Dim AryTable() As String
Dim AryRow() As String
Dim VntCell As Variant
Dim LngID As Long
'AryTable is root array
ReDim AryTable(2)
'Below is the population of the array, using #~# as a delimiter, whatever
'you feel will not come up will be best
'In the past to be safe I used #UnliklyDivider# as my delimiter, to make
'sure it was never confused or come up in
'real data
AryTable(0) = "1#~#Field1#~#Field2#~#Field3"
AryTable(1) = "1#~#Field1#~#Field2#~#Field3#~#Field4#~#Field5"
AryTable(2) = "1#~#Field1#~#Field2#~#Field3#~##~#Field5"
'This goes through each row in the array, using each one as an array in its
'own right
For LngID = 0 To UBound(AryTable, 1)
AryRow = Split(AryTable(LngID), "#~#")
For Each VntCell In AryRow
Debug.Print LngID & ": " & VntCell
Next
Next
End Sub

Related

how to populate and array with a loop

I have a strings in column "C", starting at C2 (for example: Cat, Dog, Bird, etc...) and I don't know how many. So I am using a LRow function to find the last row with data. Currently, the last row is C63 but this is expected to be different if I run the subroutine next week or next month (Hence why I said "I don't know how many"). I want to create an array for example RTArr = Array("Cat", "Dog", "Bird", etc...) So... I was thinking something like:
Dim RTArr As Variant
LRow = r.End(xlDown).Offset(x, y).Row
With ActiveSheet
For i = 2 To LRow
str = .Range("C" & i).Value
Next i
End With
Can I populate the array with something like:
Dim RTArr As Variant
LRow = r.End(xlDown).Offset(x, y).Row
With ActiveSheet
For i = 2 To LRow
ArrNum = (i - 1)
str = .Range("C" & i).Value
RTArr(ArrNum) = str
Next i
End With
Or does this not work because of the unknown size of the array? Or do I have to use "amend" in the loop? Would I be better off using a "collection" in this case? Or going about it some other way? Can I simply set a range of cells as an array without needing to loop?
If you declare a dynamic array at first (without the size), you need to ReDim it to the needed size before populating it, which in your case will be the number of rows e.g. ReDim RTArr(numberofitems). Or use a two dimensional array ReDim RTArr(numbercolumns, numberrows).
Remember that standard arrays begin at element 0, but you can define it however you like.
Remember that when inputting ranges into array Excel creates by default a two-dimensional array
More advanced techniques are possible of course, you can do some more research about VBA arrays regarding those:
1) you could ReDim the array after each element added inside of the loop, but this is mostly useful for one dimensional arrays.
2) you could define a much bigger size of array than needed before populating it, populate it, and then shrink the array to the actual size needed.
3) note that when using two (or more) dimensions ReDim Preserve works only on the last dimension.
Pseudo code for the basic populating:
Dim arr() as Variant
'we know we want to populate array with 10 elements
ReDim arr(1 to 10)
For i = 1 to 10
'This part will insert the count from the loop into the count position in array
' eg. first element of array will be a 1, second a 2 etc. until 10
arr(i) = i
Next i
If your version of Excel supports the TEXTJOIN function:
Sub Kolumn2Array()
Dim r As Range
Dim N As Long
Dim RTArray
Dim comma As String
comma = ","
N = Cells(Rows.Count, "C").End(xlUp).Row
Set r = Range("C2:C" & N)
With Application.WorksheetFunction
RTArray = Split(.TextJoin(comma, True, r), comma)
End With
End Sub

Storing data to array from worksheet

I'm trying to analyze some data from a worksheet, the first step was to find the last row, which I managed. Then I need to store the data in an array for each column to simplify further analysis.
My data looks like this:
I'm trying to store let's say the B column in an array but starting at B6:
Sub List_Rem_stock()
Dim array_Rem_Batch(1 To last_row_Rem_stock - 5) As Integer
For i = 1 To last_row_Rem_stock - 5
array_Rem_Batch(i) = Worksheets("Rem stock").Range(Bi)
Next i
Debug.Print array_Rem_Index
End Sub
last_row_Rem_stock represents the last row of the table.
Am I doing this properly?
Almost, try the code below (find explanation inside code's comments):
Option Explicit
Sub List_Rem_stock()
Dim last_row_Rem_stock As Long, i As Long
Dim array_Rem_Batch() As Long
With Worksheets("Rem stock")
last_row_Rem_stock = .Cells(.Rows.Count, "B").End(xlUp).Row ' get last row with value in colum B
ReDim array_Rem_Batch(1 To last_row_Rem_stock - 5) ' redim array size
For i = 1 To last_row_Rem_stock - 5
array_Rem_Batch(i) = .Range("B" & i).Value
Next i
End With
End Sub
You can allocate a range to an array (2D) as such:
Dim arrData as variant: arrData = Range("B1:B" & lastrow).
You can also put the array back on the spreadsheet the same way:
Range("B1:B" & lastrow) = arrData
Simple, easy and fast, without the need of iterating through data.
In your example, you would probably do it like this.
Sub List_Rem_stock()
Dim i As Long, last_row_Rem_stock As Long
Dim array_Rem_Batch As Variant
With Worksheets("Rem stock")
last_row_Rem_stock = .Cells(.Rows.Count, "B").End(xlUp).Row 'get last row in B
array_Rem_Batch = .Range("B1:B" & last_row_Rem_stock)
End With
For i = 6 To last_row_Rem_stock
Debug.Print array_Rem_Batch(i, 1)
Next i
End Sub
To note that arrays allocated this way will always start at 1, not 0.
EDIT:
I'm allocating the data starting at row 1, and not at row 6, purely for the nice 1:1 relation between array index and sheet rows. Is my prefered way, wherever the situation allows.
If array_Rem_Batch(i, 1) = Range("B" & i) Then ....
Can always allocate the data from any row you want:
array_Rem_Batch = Worksheets("Rem stock").Range("B6:B100") 'now the array has 95 rows.
In this case, array index 1, will corespond to row 6 in the sheet, and will have to manage this in the code if you need to something like this:
If array_Rem_Batch(i, 1) = Range("B" & i + 5) Then ....

How to create multi-dimensional array of unknown size?

I've got a simple problem:
I've got a set of data, which I'm sifting through and adding into an array upon criteria match
Issue is, I don't know how many matches there might be, so I need the array to be of unspecified size.
The second index of the array is static.
In an (pseudo-language) example:
if <matched criteria> = True {
i = i + 1
array( i, 1 ) => "John Doe" ' name
array( i, 2 ) => "New York" ' location
array( i, 3 ) => "02. 08. 1992" ' birthdate
}
Issue is, in vba you have to kind of pre-declare the arrays (especially with Option Explicit enabled). My thought process was to declare an array, that would start with first index at 0 and I would gradually ReDim it upon need.
Here is an simplified example of my code:
Dim cell as Range
Dim arr(0, 1 to 3) as String
Dim i As Integer: i = 0
For each cell in Range("A1:A100")
If criteria_match(cell) = True Then
arr(i, 1) = Cells(cell.row, 4)
arr(i, 2) = Cells(cell.row, 5)
arr(i, 3) = Year(Cells(cell.row, 6))
i = i + 1
ReDim Preserve arr(i, 1 to 3)
End If
Next cell
Issue is, this throws an exception:
Is there perhaps any way, I could steadily increase the size of the first array index depending on the need?
Don't size the array in the variable declaration statement.
Change:
Dim arr(0, 1 to 3) as String
to:
Dim arr() as String
ReDim arr(1 to 3, i)
Redimension it as necessary.
Edit:
For more information, see this link: https://learn.microsoft.com/en-us/office/vba/language/reference/user-interface-help/array-already-dimensioned
To briefly summarize, when you size the array in the declaration statement, it creates a static array (which can't be resized). When you don't declare a size, then it becomes a dynamic array, which can be resized.
An important note to make: ReDim Preserve can only be applied on the last dimension of the array
eg. ReDim Preserve arr(1 to 3, i) will work.
Meanwhile, ReDim Preserve arr (i, 1 to 3) will not.
Use a Type for the data and a collection for the variables based on the type.
Class Person
Public Name As String
Public Location As String
Public DoB As Date
In a Module
Sub Test()
Dim this_person As Person
Dim Persons As Collection
Dim my_cell As Excel.Range
Set Persons = New Collection
For Each my_cell In Range("A1:A100")
If Criteria_Match(my_cell) Then
Set this_person = New Person
With this_person
.Name = ActiveWorkbook.ActiveWorksheet.Cells(my_cell.Row, 4).Value2
.Location = ActiveWorkbook.ActiveWorksheet.Cells(my_cell.Row, 5).Value2
.DoB = Year(ActiveWorkbook.ActiveWorksheet.Cells(my_cell.Row, 6).Value2)
End With
Persons.Add this_person
End If
Next
End Sub

VBA Array equalled to Range

Just a quick question regarding VBA. I have this block of code
Dim colEmployees As New Collection
Dim recEmployee As New clsEmployee
Dim LastRow As Integer, myCount As Integer
Dim EmpArray As Variant
LastRow = ActiveSheet.Cells(ActiveSheet.Rows.Count, 1).End(xlUp).Row
EmpArray = ActiveSheet.Range(Cells(1, 1), Cells(LastRow, 4))
and this on the spreadsheet...
now i have done a lot of reading to grasp how array are working and i have seen exaples like
Dim myArray As Variant
Dim myArray (1 to 10, 1 to 20)
myArray = Array(“Name”, “Address”, “Phone”, “Email”)
and i totally understand them but when you have an array equaled like this
EmpArray = ActiveSheet.Range(Cells(1, 1), Cells(LastRow, 4))
How can you actually save the data in a one dimensional Array such as EmpArray? Don't you need one dimension for Rows and one for Columns? I mean how the array will actually store the data-by what order ("Tracy", "Bill", "1651", "1509",....) or ("Tracy", "1651", "25", "45")? Generally storing Ranges in Arrays especially one-dimension ones looks really odd to me. And 3 of my VBA books don't delve to this a little deeper...
If it is a 2-dimensional Array how is it posible that the code continues like:
Sub EmpPayCollection()
Dim colEmployees As New Collection
Dim recEmployee As New clsEmployee
Dim LastRow As Integer, myCount As Integer
Dim EmpArray As Variant
LastRow = ActiveSheet.Cells(ActiveSheet.Rows.Count, 1).End(xlUp).Row
EmpArray = ActiveSheet.Range(Cells(1, 1), Cells(LastRow, 4))
For myCount = 1 To **UBound(EmpArray)**
Set recEmployee = New clsEmployee
With recEmployee
.EmpName = EmpArray(myCount, 1)
.EmpID = EmpArray(myCount, 2)
.EmpRate = EmpArray(myCount, 3)
.EmpWeeklyHrs = EmpArray(myCount, 4)
colEmployees.Add recEmployee, .EmpID
End With
Next myCount
MsgBox “Number of Employees: “ & colEmployees.Count & Chr(10) & _
“Employee(2) Name: “ & colEmployees(2).EmpName
MsgBox “Tracy’s Weekly Pay: $” & colEmployees(“1651”).EmpWeeklyPay
Set recEmployee = Nothing
End Sub
How come it use UBound without clearly stating the dimension picked? I know it is optional... but could you factor also this in to your answer...?
It doesn't store the data as a single dimensioned array, it stores it as a 2-dimensional 1 based array. The value property of a range (which contains multiple cells) returns a 2-dimensional array (value is implicit here since it is the default property of a range). In your example, the array therefore looks like:
Tracy 1651 25 45
Bill 1509 25 50
With the first dimension specifying the row and the second the column - like the cell object.
Does that answer your question?

ReDim Preserve to a multi-dimensional array in VB6

I'm using VB6 and I need to do a ReDim Preserve to a Multi-Dimensional Array:
Dim n, m As Integer
n = 1
m = 0
Dim arrCity() As String
ReDim arrCity(n, m)
n = n + 1
m = m + 1
ReDim Preserve arrCity(n, m)
Whenever I do it as I have written it, I get the following error:
runtime error 9: subscript out of range
Because I can only change the last array dimension, well in my task I have to change the whole array (2 dimensions in my example) !
Is there any workaround or another solution for this?
As you correctly point out, one can ReDim Preserve only the last dimension of an array (ReDim Statement on MSDN):
If you use the Preserve keyword, you can resize only the last array
dimension and you can't change the number of dimensions at all. For
example, if your array has only one dimension, you can resize that
dimension because it is the last and only dimension. However, if your
array has two or more dimensions, you can change the size of only the
last dimension and still preserve the contents of the array
Hence, the first issue to decide is whether 2-dimensional array is the best data structure for the job. Maybe, 1-dimensional array is a better fit as you need to do ReDim Preserve?
Another way is to use jagged array as per Pieter Geerkens's suggestion. There is no direct support for jagged arrays in VB6. One way to code "array of arrays" in VB6 is to declare an array of Variant and make each element an array of desired type (String in your case). Demo code is below.
Yet another option is to implement Preserve part on your own. For that you'll need to create a copy of data to be preserved and then fill redimensioned array with it.
Option Explicit
Public Sub TestMatrixResize()
Const MAX_D1 As Long = 2
Const MAX_D2 As Long = 3
Dim arr() As Variant
InitMatrix arr, MAX_D1, MAX_D2
PrintMatrix "Original array:", arr
ResizeMatrix arr, MAX_D1 + 1, MAX_D2 + 1
PrintMatrix "Resized array:", arr
End Sub
Private Sub InitMatrix(a() As Variant, n As Long, m As Long)
Dim i As Long, j As Long
Dim StringArray() As String
ReDim a(n)
For i = 0 To n
ReDim StringArray(m)
For j = 0 To m
StringArray(j) = i * (m + 1) + j
Next j
a(i) = StringArray
Next i
End Sub
Private Sub PrintMatrix(heading As String, a() As Variant)
Dim i As Long, j As Long
Dim s As String
Debug.Print heading
For i = 0 To UBound(a)
s = ""
For j = 0 To UBound(a(i))
s = s & a(i)(j) & "; "
Next j
Debug.Print s
Next i
End Sub
Private Sub ResizeMatrix(a() As Variant, n As Long, m As Long)
Dim i As Long
Dim StringArray() As String
ReDim Preserve a(n)
For i = 0 To n - 1
StringArray = a(i)
ReDim Preserve StringArray(m)
a(i) = StringArray
Next i
ReDim StringArray(m)
a(n) = StringArray
End Sub
Since VB6 is very similar to VBA, I think I might have a solution which does not require this much code to ReDim a 2-dimensional array - using Transpose, if you are working in Excel.
The solution (Excel VBA):
Dim n, m As Integer
n = 2
m = 1
Dim arrCity() As Variant
ReDim arrCity(1 To n, 1 To m)
m = m + 1
ReDim Preserve arrCity(1 To n, 1 To m)
arrCity = Application.Transpose(arrCity)
n = n + 1
ReDim Preserve arrCity(1 To m, 1 To n)
arrCity = Application.Transpose(arrCity)
What is different from OP's question: the lower bound of arrCity array is not 0, but 1. This is in order to let Application.Transpose do it's job.
Note that Transpose is a method of the Excel Application object (which in actuality is a shortcut to Application.WorksheetFunction.Transpose). And in VBA, one must take care when using Transpose as it has two significant limitations: If the array has more than 65536 elements, it will fail. If ANY element's length exceed 256 characters, it will fail. If neither of these is an issue, then Transpose will nicely convert the rank of an array form 1D to 2D or vice-versa.
Unfortunately there is nothing like 'Transpose' build into VB6.
In regards to this:
"in my task I have to change the whole array (2 dimensions"
Just use a "jagged" array (ie an array of arrays of values). Then you can change the dimensions as you wish. You can have a 1-D array of variants, and the variants can contain arrays.
A bit more work perhaps, but a solution.
I haven't tested every single one of these answers but you don't need to use complicated functions to accomplish this. It's so much easier than that! My code below will work in any office VBA application (Word, Access, Excel, Outlook, etc.) and is very simple. Hope this helps:
''Dimension 2 Arrays
Dim InnerArray(1 To 3) As Variant ''The inner is for storing each column value of the current row
Dim OuterArray() As Variant ''The outer is for storing each row in
Dim i As Byte
i = 1
Do While i <= 5
''Enlarging our outer array to store a/another row
ReDim Preserve OuterArray(1 To i)
''Loading the current row column data in
InnerArray(1) = "My First Column in Row " & i
InnerArray(2) = "My Second Column in Row " & i
InnerArray(3) = "My Third Column in Row " & i
''Loading the entire row into our array
OuterArray(i) = InnerArray
i = i + 1
Loop
''Example print out of the array to the Intermediate Window
Debug.Print OuterArray(1)(1)
Debug.Print OuterArray(1)(2)
Debug.Print OuterArray(2)(1)
Debug.Print OuterArray(2)(2)
I know this is a bit old but I think there might be a much simpler solution that requires no additional coding:
Instead of transposing, redimming and transposing again, and if we talk about a two dimensional array, why not just store the values transposed to begin with. In that case redim preserve actually increases the right (second) dimension from the start. Or in other words, to visualise it, why not store in two rows instead of two columns if only the nr of columns can be increased with redim preserve.
the indexes would than be 00-01, 01-11, 02-12, 03-13, 04-14, 05-15 ... 0 25-1 25 etcetera instead of 00-01, 10-11, 20-21, 30-31, 40-41 etcetera.
As long as there is only one dimension that needs to be redimmed-preserved the approach would still work: just put that dimension last.
As only the second (or last) dimension can be preserved while redimming, one could maybe argue that this is how arrays are supposed to be used to begin with.
I have not seen this solution anywhere so maybe I'm overlooking something?
(Posted earlier on similar question regarding two dimensions, extended answer here for more dimensions)
You can use a user defined type containing an array of strings which will be the inner array. Then you can use an array of this user defined type as your outer array.
Have a look at the following test project:
'1 form with:
' command button: name=Command1
' command button: name=Command2
Option Explicit
Private Type MyArray
strInner() As String
End Type
Private mudtOuter() As MyArray
Private Sub Command1_Click()
'change the dimensens of the outer array, and fill the extra elements with "1"
Dim intOuter As Integer
Dim intInner As Integer
Dim intOldOuter As Integer
intOldOuter = UBound(mudtOuter)
ReDim Preserve mudtOuter(intOldOuter + 2) As MyArray
For intOuter = intOldOuter + 1 To UBound(mudtOuter)
ReDim mudtOuter(intOuter).strInner(intOuter) As String
For intInner = 0 To UBound(mudtOuter(intOuter).strInner)
mudtOuter(intOuter).strInner(intInner) = "1"
Next intInner
Next intOuter
End Sub
Private Sub Command2_Click()
'change the dimensions of the middle inner array, and fill the extra elements with "2"
Dim intOuter As Integer
Dim intInner As Integer
Dim intOldInner As Integer
intOuter = UBound(mudtOuter) / 2
intOldInner = UBound(mudtOuter(intOuter).strInner)
ReDim Preserve mudtOuter(intOuter).strInner(intOldInner + 5) As String
For intInner = intOldInner + 1 To UBound(mudtOuter(intOuter).strInner)
mudtOuter(intOuter).strInner(intInner) = "2"
Next intInner
End Sub
Private Sub Form_Click()
'clear the form and print the outer,inner arrays
Dim intOuter As Integer
Dim intInner As Integer
Cls
For intOuter = 0 To UBound(mudtOuter)
For intInner = 0 To UBound(mudtOuter(intOuter).strInner)
Print CStr(intOuter) & "," & CStr(intInner) & " = " & mudtOuter(intOuter).strInner(intInner)
Next intInner
Print "" 'add an empty line between the outer array elements
Next intOuter
End Sub
Private Sub Form_Load()
'init the arrays
Dim intOuter As Integer
Dim intInner As Integer
ReDim mudtOuter(5) As MyArray
For intOuter = 0 To UBound(mudtOuter)
ReDim mudtOuter(intOuter).strInner(intOuter) As String
For intInner = 0 To UBound(mudtOuter(intOuter).strInner)
mudtOuter(intOuter).strInner(intInner) = CStr((intOuter + 1) * (intInner + 1))
Next intInner
Next intOuter
WindowState = vbMaximized
End Sub
Run the project, and click on the form to display the contents of the arrays.
Click on Command1 to enlarge the outer array, and click on the form again to show the results.
Click on Command2 to enlarge an inner array, and click on the form again to show the results.
Be careful though: when you redim the outer array, you also have to redim the inner arrays for all the new elements of the outer array
I stumbled across this question while hitting this road block myself. I ended up writing a piece of code real quick to handle this ReDim Preserve on a new sized array (first or last dimension). Maybe it will help others who face the same issue.
So for the usage, lets say you have your array originally set as MyArray(3,5), and you want to make the dimensions (first too!) larger, lets just say to MyArray(10,20). You would be used to doing something like this right?
ReDim Preserve MyArray(10,20) '<-- Returns Error
But unfortunately that returns an error because you tried to change the size of the first dimension. So with my function, you would just do something like this instead:
MyArray = ReDimPreserve(MyArray,10,20)
Now the array is larger, and the data is preserved. Your ReDim Preserve for a Multi-Dimension array is complete. :)
And last but not least, the miraculous function: ReDimPreserve()
'redim preserve both dimensions for a multidimension array *ONLY
Public Function ReDimPreserve(aArrayToPreserve,nNewFirstUBound,nNewLastUBound)
ReDimPreserve = False
'check if its in array first
If IsArray(aArrayToPreserve) Then
'create new array
ReDim aPreservedArray(nNewFirstUBound,nNewLastUBound)
'get old lBound/uBound
nOldFirstUBound = uBound(aArrayToPreserve,1)
nOldLastUBound = uBound(aArrayToPreserve,2)
'loop through first
For nFirst = lBound(aArrayToPreserve,1) to nNewFirstUBound
For nLast = lBound(aArrayToPreserve,2) to nNewLastUBound
'if its in range, then append to new array the same way
If nOldFirstUBound >= nFirst And nOldLastUBound >= nLast Then
aPreservedArray(nFirst,nLast) = aArrayToPreserve(nFirst,nLast)
End If
Next
Next
'return the array redimmed
If IsArray(aPreservedArray) Then ReDimPreserve = aPreservedArray
End If
End Function
I wrote this in like 20 minutes, so there's no guarantees. But if you would like to use or extend it, feel free. I would've thought that someone would've had some code like this up here already, well apparently not. So here ya go fellow gearheads.
This is more compact and respect the intial first position in array and just use the inital bound to add old value.
Public Sub ReDimPreserve(ByRef arr, ByVal size1 As Long, ByVal size2 As Long)
Dim arr2 As Variant
Dim x As Long, y As Long
'Check if it's an array first
If Not IsArray(arr) Then Exit Sub
'create new array with initial start
ReDim arr2(LBound(arr, 1) To size1, LBound(arr, 2) To size2)
'loop through first
For x = LBound(arr, 1) To UBound(arr, 1)
For y = LBound(arr, 2) To UBound(arr, 2)
'if its in range, then append to new array the same way
arr2(x, y) = arr(x, y)
Next
Next
'return byref
arr = arr2
End Sub
I call this sub with this line to resize the first dimension
ReDimPreserve arr2, UBound(arr2, 1) + 1, UBound(arr2, 2)
You can add an other test to verify if the initial size is not upper than new array. In my case it's not necessary
Easiest way to do this in VBA is to create a function that takes in an array, your new amount of rows, and new amount of columns.
Run the below function to copy in all of the old data back to the array after it has been resized.
function dynamic_preserve(array1, num_rows, num_cols)
dim array2 as variant
array2 = array1
reDim array1(1 to num_rows, 1 to num_cols)
for i = lbound(array2, 1) to ubound(array2, 2)
for j = lbound(array2,2) to ubound(array2,2)
array1(i,j) = array2(i,j)
next j
next i
dynamic_preserve = array1
end function
Function Redim2d(ByRef Mtx As Variant, ByVal QtyColumnToAdd As Integer)
ReDim Preserve Mtx(LBound(Mtx, 1) To UBound(Mtx, 1), LBound(Mtx, 2) To UBound(Mtx, 2) + QtyColumnToAdd)
End Function
'Main Code
sub Main ()
Call Redim2d(MtxR8Strat, 1) 'Add one column
end sub
'OR
sub main2()
QtyColumnToAdd = 1 'Add one column
ReDim Preserve Mtx(LBound(Mtx, 1) To UBound(Mtx, 1), LBound(Mtx, 2) To UBound(Mtx, 2) + QtyColumnToAdd)
end sub
If you not want include other function like 'ReDimPreserve' could use temporal matrix for resizing. On based to your code:
Dim n As Integer, m As Integer, i as Long, j as Long
Dim arrTemporal() as Variant
n = 1
m = 0
Dim arrCity() As String
ReDim arrCity(n, m)
n = n + 1
m = m + 1
'VBA automatically adapts the size of the receiving matrix.
arrTemporal = arrCity
ReDim arrCity(n, m)
'Loop for assign values to arrCity
For i = 1 To UBound(arrTemporal , 1)
For j = 1 To UBound(arrTemporal , 2)
arrCity(i, j) = arrTemporal (i, j)
Next
Next
If you not declare of type VBA assume that is Variant.
Dim n as Integer, m As Integer

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