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The source code in this issue is designed for Visual Basic 5.0 and above. It is geared towards the intermediate to advanced programmer. If you have any questions about this issue, please email us at questions@codeoftheweek.com
This issue introduces a QuickSort algorithm. It was written by Ray Cole with some small modifications by our programmers. This algorithm is often the fastest type of sorting algorithm. It can sort two dimensional arrays of nearly any data type. We chose to sacrifice some performance penalties in order to make the routine able to sort many data types (since Variant arrays are not super fast).
Public Sub QuickSort(ByRef arrSort As Variant, intSortCol As Integer)
This routine requires the second dimension to the be "column" counter. For example a two column 100 element array would be dimensioned as "Redim lArray(1 to 100, 1 to 2)".
None.
This example shows how to use the QuickSort routine to sort a two dimensional array by each of its columns.
Dim lArray() As Long
Dim x As Integer
Dim y As Integer
ReDim lArray(1 To 10, 1 To 2)
' Fills the array with random data
For x = 1 To 2
For y = 1 To 10
lArray(y, x) = Rnd * 100
Next
Next
Debug.Print "Sorted on Column 1"
QuickSort lArray, 1 ' Sort the array using the first column
For y = 1 To 10
Debug.Print lArray(y, 1) & ", " & lArray(y, 2)
Next
Debug.Print "Sorted on Column 2"
QuickSort lArray, 2 ' Sort the array using the second column
For y = 1 To 10
Debug.Print lArray(y, 1) & ", " & lArray(y, 2)
Next
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