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Edexcel IAL Decision Maths 1 - Problems discussion thread 2016/2017

Hi guys,
I'm self-studying this subject and I'm finding some trouble in some sections so I opened this thread so that anyone who's also studying D1 could post their doubts here.
Reply 1
Avatar for Reshyna
Reshyna
OP
15
Could someone help me with this:
What is Dijkstra's algorithm?
How is it used to solve problems?
Please, anyone help me. I couldn't understand it :////
Original post by Reshyna
Could someone help me with this:
What is Dijkstra's algorithm?
How is it used to solve problems?
Please, anyone help me. I couldn't understand it :////


I don't do decision maths, so I can't help, sorry. I'm sure there'll be plenty of other helpers. :smile:
Original post by Reshyna
Could someone help me with this:
What is Dijkstra's algorithm?
How is it used to solve problems?
Please, anyone help me. I couldn't understand it :////


https://m.youtube.com/watch?v=Wp1zsVSEXTo
Reply 4
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Reshyna
OP
15
Original post by K-Man_PhysCheM
I don't do decision maths, so I can't help, sorry. I'm sure there'll be plenty of other helpers. :smile:


Oh
It's okay :h:
Reply 5
Avatar for Reshyna
Reshyna
OP
15
Original post by SeanFM


Thanks a lot!
That video was helpful
I've managed to understand it now :smile:
Reply 6
Avatar for Reshyna
Reshyna
OP
15
Please, someone help me with route inspection in D1
Please I need your help. I don't understand it. How do you find the minimal route?
Please, someone, explain me. I seriously don't understand it.
Original post by Reshyna
Please, someone help me with route inspection in D1
Please I need your help. I don't understand it. How do you find the minimal route?
Please, someone, explain me. I seriously don't understand it.


Do you have a D1 textbook? I think it should cover it better than a person can (from scratch, that is)..

Or find further videos online that go through finding a minimum route in a past paper (e.g. Maths solutions)

I'd have to revise it myself to give a proper explanation so I would suggest doing the above first. If you are still stuck and have specific questions, let me know :smile:
Reply 8
Avatar for Reshyna
Reshyna
OP
15
Original post by SeanFM
Do you have a D1 textbook? I think it should cover it better than a person can (from scratch, that is)..

Or find further videos online that go through finding a minimum route in a past paper (e.g. Maths solutions)

I'd have to revise it myself to give a proper explanation so I would suggest doing the above first. If you are still stuck and have specific questions, let me know :smile:


Hey Sean
Sorry for the late reply
Yes I have one and it's edexcel.
I've cleared my doubt
but could u help me with this plz?
Is this one correct?
doubt.png
Original post by Reshyna
Hey Sean
Sorry for the late reply
Yes I have one and it's edexcel.
I've cleared my doubt
but could u help me with this plz?
Is this one correct?
doubt.png


That could be checked using a calculator.


However, by inspection if you look at the last two rows: the second inequality is not satisfied at y=81 and if you make it y=82, 3x+5y is only going to increase (by 5 in fact) so I'm not sure how the second inequality is going to be satisfied as you increase y by 1
Reply 10
Avatar for 0161auea
0161auea
any tips on how to revise gantt charts and scheduling ?

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