Well, the array use will save a lot of code running time. But, there are some issues which must be understood:
First thing when work in VBA and your project increases, is to properly declare your variables. Try making a reflex in putting Option Explicit
on top of all your modules. In the array case, the thing, from this point of view stays like that:
Dim Arr() As variant, arr1 As Variant
Both declarations work in excel. But the second one is recommended (on mai taste), when you need an array from a range. When you want building a, let us say, result array, it will be zero based and you must take care of the range size where the values will be returned.
The array content cannot be retrieved exactly like you tried in your question in case of not fix/known number of elements. Look at the next test code:
Sub testArrays()
Dim sh As Worksheet, rng As Range, arrTest As Variant
Set sh = ActiveSheet
Set rng = sh.Range("A1:F4")
arrTest = rng.value
sh.Range("J1").Resize(UBound(arrTest, 1), UBound(arrTest, 2)).value = arrTest
End Sub
It is recommended to use arrTest = sh.Range("A1:F4").value
. Using range Value
. Excel is able to understand what you need according to your declaration, but it is good for you to differentiate somehow, from the way of the range definition.
Sometimes, you need to build an array during analyzing of the dynamic range. If you cannot know the new array dimensions and need to Redim (Preserve), only the second dimension of the array can be re-dimensioned and Transpose
function must be use, in such a case. And finally the resulted array can be properly loaded in a range, only if you know the array number of rows and columns.
- You can deduce the range row, from the array row, in the next way:
If we are referring to the above
arrTest
we know that its first row is first row of the sheet and it has 5 columns.
So, arrTest(3, 1)
will be sh.Range("A3").Value
and its row would be 3.
Then, arrTest(3, 4)
will be sh.Range("D3").Value
and its row would be also 3.
If your array comes from a range starting with the fifth row, you must add four in order to obtain the sheet row extracted from the array row...
So, your example can be transformed in:
If arrTest(3, 4) ="Pending" then sh.Cells(3, 4).Font.Bold=1 Else sh.Cells(3, 4).Font.Bold=0
Now if you need a ranges array, you cannot do it in the way you tried. You must use the ranges address and build the range at the end:
Sub testArraysBis()
Dim sh As Worksheet, rng As Range, rng1 As Range, lastCol As Long
Dim rng2, arrTest As Variant, arrT As Variant, arrF As Variant
Set sh = ActiveSheet
lastCol = sh.Cells(1, Cells.Columns.Count).End(xlToLeft).column
Set rng = sh.Range(sh.Cells(1, 1), sh.Cells(4, lastCol))
Set rng1 = sh.Range("A5:F6")
arrT = Array(rng.Address, rng1.Address)
arrTest = rng.value
Debug.Print UBound(arrTest), LBound(arrTest)
sh.Range("J1").Resize(UBound(arrTest, 1), UBound(arrTest, 2)).value = arrTest
Set rng2 = sh.Range(arrT(0))
Debug.Print rng2.Address
arrF = sh.Range(arrT(0)).value
Debug.Print UBound(arrF, 2)
End Sub
rng2
range will be built using the address string, extracted from arrT
array. An array (arrF
) can also be extracted from the arrT
first element...
- Epilog:
The best way, in terms of speed, is to load the range in arrays, make all processing using them (in memory and very fast due to this aspect), but the most important issue is to build another array (or even a range, using
Union
) and retrieve the data AT ONCE. Sending of each partial processing result to a cell/range consumes a lot of time and other resources, for a big range size...