Solved

VB Loop - All posible combinations into an array

Posted on 2009-04-09
5
262 Views
Last Modified: 2012-05-06
Hi,
Im trying to write some results into an array for working out all possible combinations of days, weeks and months, between 2 dates.

For exmaple, between 1st Jan and the 20th jan, i want to know all combinations of days, weeks, months you could have

Total Days = 21
Day = 1
Week = 7
Month = 31

Combinations to an array, should be something like:
1 = 21day, 0 Weeks, 0 Months
2 = 14day, 1 week,0 months
3 = 7day, 2 week,0 months
4 = 0day, 3 week,0 months
sub CalCombinations()
 
StartDate = "1/01/2009"
EndDate = "31/01/2009"
 
TotalDays = DateDiff("d", StartDate, EndDate) + 1 'add 1 day to cover for the start day
TotalFullWeeks = DateDiff("w", StartDate, EndDate)
TotalFullMonths = DateDiff("m", StartDate, EndDate)
 
End sub

Open in new window

0
Comment
Question by:jamiepryer
  • 3
  • 2
5 Comments
 
LVL 53

Accepted Solution

by:
Dhaest earned 250 total points
ID: 24113751
I made some assumptions:
- A month has 4 weeks
- A month has 30 days (average)

    Dim possibleCombinations() As String
    ReDim possibleCombinations(0)
    StartDate = "1/01/2009"
    EndDate = "28/02/2009"
    
    totalDays = DateDiff("d", StartDate, EndDate) + 1 'add 1 day to cover for the start day
    TotalFullWeeks = DateDiff("w", StartDate, EndDate)
    totalFullMonths = DateDiff("m", StartDate, EndDate)
 
    Dim strToAdd As String
    For j = 0 To totalFullMonths
        For i = 0 To (TotalFullWeeks + (totalFullMonths * 4))
            If (totalDays - ((j * 30) + (i * 7))) > 0 Then
                strToAdd = (totalDays - ((j * 30) + (i * 7))) & " days, " & i & " Weeks, " & j & " Months"
                possibleCombinations(UBound(possibleCombinations)) = strToAdd
                ReDim Preserve possibleCombinations(UBound(possibleCombinations) + 1) As String
            End If
        Next i
    Next j
    ReDim Preserve possibleCombinations(UBound(possibleCombinations) - 1) As String

Open in new window

0
 

Author Comment

by:jamiepryer
ID: 24136360
thanks, that works really well
can you just talk me through your thinking for the

"    For I = 0 To (TotalFullWeeks + (totalFullMonths * 4))"

and

"If (totalDays - ((j * 30) + (I * 7))) > 0 Then"

please..
0
 
LVL 53

Expert Comment

by:Dhaest
ID: 24136628
1. For I = 0 To (TotalFullWeeks + (totalFullMonths * 4))"
We need to loop for each week (but a month contains 4 weeks, that's why you have
"number of weeks" + ("number of months" * 4 = number of weeks for these months)

2. If (totalDays - ((j * 30) + (I * 7))) > 0 Then
j represents a month (so x-monts * 30 days to have the number of days
l represents a week (so x-weeks * 7 days) to have the number of days

Totaldays is a number that gives a an number of days between start and end.
When we have for example: 1 week and 1 day -> we'll have also the possibility to have 8 days
If we don't use formula above, we'll get the following result
1 week - 1 days
0 week - 8 days
0 week - 1 days
The last is incorrect off-course
0
 

Author Comment

by:jamiepryer
ID: 24137155
thanks!
0
 
LVL 53

Expert Comment

by:Dhaest
ID: 24137221
Glad I could help you...
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Command to modify Registry entry 5 124
How to use odbc in vb to connect to ms sql 14 62
Create Consolidation Sheet 3 38
save excel in the same active file's folder. 8 20
Hello again, all.  For those of you that have been following along, you'll know that this is my third article on this topic (though it is not Part III).  This article is sort of remedial, and probably the topic with which I should have started the s…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.

839 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question