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# sorting....

The following is a sort routine that I got from a book.

An array of times (1 to 10,3)
where times(x,1) is a time in mil. secs.
where times(x,2) is an ID
where times(x,3) a number from 0 to ??

I need to sort first on the time from least to greater
then on the number from greatest to least.

By looking at this routine can somebody help me with this?

Thanks!
Craig

=================================================
Option Compare Database
Option Explicit

' From "VBA Developer's Handbook"
' by Ken Getz and Mike Gilbert

' Quicksort for simple data types.

' Indicate that a parameter is missing.
Const dhcMissing = -2

Sub dhQuickSort(varArray As Variant, _
Optional intLeft As Integer = dhcMissing, _
Optional intRight As Integer = dhcMissing)

' From "VBA Developer's Handbook"
' by Ken Getz and Mike Gilbert

' Entry point for sorting the array.

' This technique uses the recursive Quicksort
' algorithm to perform its sort.

' In:
'   varArray:
'       A variant pointing to an array to be sorted.
'       This had better actually be an array, or the
'       code will fail, miserably. You could add
'       a test for this:
'       If Not IsArray(varArray) Then Exit Sub
'       but hey, that would slow this down, and it's
'       only YOU calling this procedure.
'       Make sure it's an array. It's your problem.
'   intLeft:
'   intRight:
'       Lower and upper bounds of the array to be sorted.
'       If you don't supply these values (and normally, you won't)
'       the code uses the LBound and UBound functions
'       to get the information. In recursive calls
'       to the sort, the caller will pass this information in.
'       To allow for passing integers around (instead of
'       larger, slower variants), the code uses -2 to indicate
'       that you've not passed a value. This means that you won't
'       be able to use this mechanism to sort arrays with negative
'       indexes, unless you modify this code.
' Out:
'       The data in varArray will be sorted.

Dim i As Integer
Dim j As Integer
Dim varTestVal As Variant
Dim intMid As Integer

If intLeft = dhcMissing Then intLeft = LBound(varArray)
If intRight = dhcMissing Then intRight = UBound(varArray)

If intLeft < intRight Then
intMid = (intLeft + intRight) \ 2
varTestVal = varArray(intMid, 1)
i = intLeft
j = intRight
Do
Do While varArray(i, 1) < varTestVal
i = i + 1
Loop
Do While varArray(j, 1) > varTestVal
j = j - 1
Loop
If i <= j Then
SwapElements varArray, i, j
i = i + 1
j = j - 1
End If
Loop Until i > j
' To optimize the sort, always sort the
' smallest segment first.
If j <= intMid Then
Call dhQuickSort(varArray, intLeft, j)
Call dhQuickSort(varArray, i, intRight)
Else
Call dhQuickSort(varArray, i, intRight)
Call dhQuickSort(varArray, intLeft, j)
End If
End If
End Sub

Private Sub SwapElements(varItems As Variant, intItem1 As Integer, intItem2 As Integer)
Dim varTemp As Variant
Dim varTemp2 As Variant
Dim varTemp3 As Variant

varTemp = varItems(intItem2, 1)
varTemp2 = times(intItem2, 2)
varTemp3 = times(intItem2, 3)

varItems(intItem2, 1) = varItems(intItem1, 1)

times(intItem2, 2) = times(intItem1, 2)
times(intItem2, 3) = times(intItem1, 3)

varItems(intItem1, 1) = varTemp
times(intItem1, 2) = varTemp2
times(intItem1, 3) = varTemp3
End Sub

0
cyberimage
1 Solution

Commented:
Are you asking how to use the qsort subroutine?
What do you means by writing:
"I need to sort first on the time from least to greater then on the number from greatest to least."
Do you mean you need to that the number is sub sort of the time? Which means if the time equal you sort by the number. Or may be you wanted to make two separated qsorts, one by time the second by number?

If you are asking how to use the sort subrutine

If you are asking about main sorting by time sun-sorting by number, this sorting function will not make the whole work for you, you will have to first sort by time, the take an equal series of equal time and sort them by the number. If you don’t know how to make the sub-sorting, pleasse let me know.

Good Luck
Schild

0

Commented:
Restructure you variant array to one array of variants, so that you can do the following statements
t1 = times(1)
t1(1) is a time in mil. secs.
t2(2) is an ID
t3(3) a number from 0 to ??

replace (twice)
varArray(i, 1) < varTestVal
with
IsLessThen (varArray(i, 1) , varTestVal)

private function IsLessThen(byval x1 as variant, byval x2 as variant)
if x1(1) < x2(1) then
IsLessThen = true
else
if (x1(1) = x2(1)) then
if (x1(2) > x2(2)) then
IsLessThen = true
else
IsLessThen = false
end if
else
IsLessThen = false
end if
end if
end function
0
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