Query related to Visual Basic ReDim / Redim.de

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1

ReDim Statement (Visual Basic) | Microsoft Docs

December 03, 2018

When you use ReDim to redimension an array, Visual Basic creates a new array and releases the previous one. This takes execution time. Therefore, if the number of items you are working with changes frequently, or you cannot predict the maximum number of items you need, you'll usually obtain better performance by using a collection.

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2

Excel VBA - How to Redim a 2D array? - Stack …

December 03, 2018

In Excel via Visual Basic, I am iterating through a CSV file of invoices that is loaded into Excel. The invoices are in a determinable pattern by client.This isn't exactly intuitive, but you cannot Redim (VB6 Ref) an array if you dimmed it with dimensions. Exact quote from linked page is: The ReDim statement is used to size or resize a dynamic array that has already been formally declared using a Private, Public, or Dim statement with empty parentheses (without dimension subscripts). In other words, instead of dim invoices(10,0) You should use Dim invoices() Redim invoices(10,0) Then when you ReDim, you'll need to use Redim Preserve (10,row) Warning: When Redimensioning multi-dimensional arrays, if you want to preserve your values, you can only increase the last dimension. I.E. Redim Preserve (11,row) or even (11,0) would fail.Meilleure réponse · 32I 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.10I 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 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?3here is updated code of the redim preseve method with variabel declaration, hope @Control Freak is fine with it:) Option explicit 'redim preserve both dimensions for a multidimension array *ONLY Public Function ReDimPreserve(aArrayToPreserve As Variant, nNewFirstUBound As Variant, nNewLastUBound As Variant) As Variant Dim nFirst As Long Dim nLast As Long Dim nOldFirstUBound As Long Dim nOldLastUBound As Long 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 Function2Here is how I do this. Dim TAV() As Variant Dim ArrayToPreserve() as Variant TAV = ArrayToPreserve ReDim ArrayToPreserve(nDim1, nDim2) For i = 0 To UBound(TAV, 1) For j = 0 To UBound(TAV, 2) ArrayToPreserve(i, j) = TAV(i, j) Next j Next i0i solved this in a shorter fashion. Dim marray() as variant, array2() as variant, YY ,ZZ as integer YY=1 ZZ=1 Redim marray(1 to 1000, 1 to 10) Do while ZZ<100 ' this is populating the first array marray(ZZ,YY)= "something" ZZ=ZZ+1 YY=YY+1 Loop 'this part is where you store your array in another then resize and restore to original array2= marray Redim marray(1 to ZZ-1, 1 to YY) marray = array20How do I set up a "jagged array" in VBA?ReDim Preserve to a Multi-Dimensional Array in Visual Basic 6Afficher plus de résultatsPreserve with ReDim - VB 6 sample code - …Traduire cette pagehttps://www.developerfusion.com/code/241/preserve-with-redimEach time you execute the ReDim statement, all the values currently stored in the array are lost. Visual Basic resets the values to the Empty value (for Variant arrays), to zero (for numeric arrays), to a zero-length string (for string arrays), or to Nothing (for arrays of objects). This is useful

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3

Using redim to initialize array. - …

December 03, 2018

I'm currently reading "Data Structures and Algorithms using VB.Net" and in one of his examples, he initializes an array of integers using ReDim Preserve.

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Visual Basic #5 - Arrays, Redim, Preserve, Multi ... - …

December 03, 2018

29/05/2013 · This feature is not available right now. Please try again later.Auteur : SpeedTutorialzVues : 6,8 000ReDim Statement (Visual Basic) - msdn.microsoft.comTraduire cette pagehttps://msdn.microsoft.com/en-us/sync/w8k3cys2(v=vs.95).aspxFor the latest documentation on Visual Studio 2017, see Visual Studio 2017 Documentation. Reallocates storage space for an array variable. You can use ReDim only at procedure level. Therefore, the declaration context for the variable must be a procedure; it can't be a source file, a namespace, an

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5

The VBA Array Tutorial - Master Excel VBA Arrays

December 03, 2018

01/10/2015 · Visual Basic 'Declare dynamic Array Dim dynamicArray() As Long 'Set the size of the Array ReDim dynamicArray(1 To 10) 'Print size of the Array Debug.Print UBound(dynamicArray)-LBound(dynamicArray) +1 'Result: 10.4/5(7)Dynamic Array in Excel VBA - Easy Excel MacrosTraduire cette pagehttps://www.excel-easy.com/vba/examples/dynamic-array.html6. Exit the Visual Basic Editor and click the command button on the sheet. Result: 7. Now to clearly see why this is called a dynamic array, add a number to column A.

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6

Arrays in Visual Basic .NET - Programming References

December 03, 2018

In Visual Basic .NET all arrays are start from zero, which means that the index of the first element in the array is zero. Arrays inherit from the Array class in the System namespace. We can declare arrays by using Dim, ReDim, Static, Private, Public and Protected keywords.

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VB Array - Arrays in Visual Basic 6 - freetutes.com

December 03, 2018

Visual Basic starts indexing the array with 0. Therefore, the preceding array actually holds 101 items. Therefore, the preceding array actually holds 101 items. Most programs don't use static arrays because programmers rarely know at compile time how many items you need and also because static arrays can't be resized during execution.

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8

Arrays in Visual Basic

December 03, 2018

When you do this, Visual Basic creates a new array and releases the previous array for disposal. This takes execution time. Therefore, if the number of items you are working with changes frequently, or you cannot predict the maximum number of items you need, you might obtain better performance using a …

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9

ReDim Statement - csidata.com

December 03, 2018

Remarks The ReDim statement is used to size or resize a dynamic array that has already been formally declared using a Private, Public, or Dim statement with …

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Arrays in Visual Basic - vb-net

December 03, 2018

Arrays in Visual Basic An array is a set of values that are logically related to each other, such as the number of students in each grade in a grammar

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