Solved

VB Loop - All posible combinations into an array

Posted on 2009-04-09
5
274 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

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

Script to copy or move mouse-selected collection of files plus targets referenced by shortcuts (.lnk) The purpose of this article is to help illuminate the real challenges and options available (where they may exist) for utilizing simple scriptin…
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…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

710 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