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# D2 6th June 2013 Watch

1. (Original post by Knoyle quiah)
Hello just wondering where these questions are from , the old edexcel d1? solomon?
Hi it's D1 January 2006 - old spec contains some of D2 stuff on simplex and flow give it a go and let me now as i still do not understand the markscheme.

Thanks,
Smith
2. (Original post by mathswiz:))
Draw on the arc EJ with capacity 5, then look for how much spare capacity you can have going along this arc. Remember that everything going into an arc must equal everything coming out of the arc. You want to work out what is the maximum flow you can get through the arc EJ and then the same for the arc FH.

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Hi could you help me on the question that i posted earlier
Thanks,
Smith
3. (Original post by Lilmzbest)
Aah simplex, it just makes you want to cry tbh i just practiced simplex a lot and i'm fairly confident in it now, i just make sure to double check all my answers as soon as i get to the row operations bit, like most of D2 i find that you are more likely to lose marks from wrong calculation than by not knowing what you're doing

I'm just getting lots of practice (doing all the exercises in the book) and trying to keep the algorithms fresh in my head, so the exam should be okay i hope
Hi could you give my question i posted earlier a go
Thanks,
Smith
4. (Original post by smith50)
Hi could you help me on the question that i posted earlier
Thanks,
Smith
Use your labelled diagram with arrows going both ways, add in the arc DG with 100 capacity and 0 flow and augment the network again.

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5. (Original post by smith50)
Hi could you give my question i posted earlier a go
Thanks,
Smith
Which one? post no. please, i'm too lazy to go trawling back through the thread
6. (Original post by Lilmzbest)
Which one? post no. please, i'm too lazy to go trawling back through the thread
post 231
Smith
7. (Original post by mathswiz:))
Use your labelled diagram with arrows going both ways, add in the arc DG with 100 capacity and 0 flow and augment the network again.

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Thanks, it'sjust that i don't get how they calculate the value of the final flow my answer doesn't match the MS.Could you explain a bit more or even try it as i am so stuck please
Thanks,
Smith
8. (Original post by smith50)
Thanks, it'sjust that i don't get how they calculate the value of the final flow my answer doesn't match the MS.Could you explain a bit more or even try it as i am so stuck please
Thanks,
Smith
Augmenting the route SBDGT increases the flow by 86. Add this to 437 and 236 giving you 759
Attached Images
9. Network flow.pdf (702.2 KB, 51 views)
10. (Original post by mathswiz:))
Augmenting the route SBDGT increases the flow by 86. Add this to 437 and 236 giving you 759
Thanks so much tsr is not letting me rep you anymore .
I would give you 100 if i could.Your a legend.If you get stuck on anything post it on here
happy to help
Thanks,
Smith
11. Hey guys, I was wondering:

If we are formulating a transportation problem as a linear programming problem, and the problem is unbalanced, how do we treat this?

Do we add a dummy demand with zero costs first, and include that in the linear programming?

Thanks
12. (Original post by smith50)
post 231
Smith
Considering there's only 130 posts in this thread i think you might be reading the wrong number.... i mean the number at the top right of your post
13. (Original post by Lilmzbest)
Considering there's only 130 posts in this thread i think you might be reading the wrong number.... i mean the number at the top right of your post
Oh i'm sorry it's post 110
Smith
14. (Original post by Hamburglar)
Hey guys, I was wondering:

If we are formulating a transportation problem as a linear programming problem, and the problem is unbalanced, how do we treat this?

Do we add a dummy demand with zero costs first, and include that in the linear programming?

Thanks
I don't think you add a dummy but instead of writting your constaints as equations you write them as inequalities.
Hope that helps,
Smith
15. (Original post by smith50)
I don't think you add a dummy but instead of writting your constaints as equations you write them as inequalities.
Hope that helps,
Smith
Ah the inequalities thing does make sense, thank you
16. (Original post by Hamburglar)
Ah the inequalities thing does make sense, thank you
That's not dealt with in the book, is it?
17. (Original post by mathswiz:))
Use your labelled diagram with arrows going both ways, add in the arc DG with 100 capacity and 0 flow and augment the network again.

Posted from TSR Mobile
For game theory when representing it the graphical method i sometimes don't get how to choose the optimal point.Could you help me with this please
Thanks,
Smith
18. (Original post by knowledgecorruptz)
That's not dealt with in the book, is it?
I don't think so but they expect you to know it
Smith
19. (Original post by knowledgecorruptz)
That's not dealt with in the book, is it?
Not to my knowledge but I was having a peek at practice paper B which I haven't done yet, and there appears to be a question just like that.

I just wanted to know how you'd deal with it and why
20. (Original post by smith50)
I don't think so but they expect you to know it
Smith
Okay, thanks
21. Hi guys,

I'm a bit confused when graphing a game theory problem. The optimal point - which one is it?
I've resorted to finding the intersection of all the lines and find the point which gives the highest value but this isn't correct for some reason. Can anyone shed some light on this matter?

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