Edexcel A2 D2 Mathematics June 2016 - Official Thread

With DP, would you get penalised for doing your states the opposite way round to the mark scheme? -for example, if the context is number of machines in storage already, is it ok to do it in the order 0 then 1 then 2 or should it be 2 then 1 then 0 (as the eg in the mark scheme shows). Or is there a rule on the order states should be done in?

thats fine

Reply 141

Asurat

17

For activity networks, when doing flow-augmenting routes, are you allowed to do a forward flow and back flow down the same arc or is this not allowed? Tried it on a paper just now and it didn't work out.

Reply 142

ReeceFraser

1

Anyone got any hints on how to start dyanmic programmings?

Reply 143

KloppOClock

14

Original post by Asurat

For activity networks, when doing flow-augmenting routes, are you allowed to do a forward flow and back flow down the same arc or is this not allowed? Tried it on a paper just now and it didn't work out.

i dont understand what you mean by doing a forward flow and a back flow

Reply 144

economicss

3

Original post by KloppOClock

well seen as that question is from an actual exam paper... yes

What would we do if there were 4 products instead of me, would the middle bit of the production table be the same structure? Thanks!

Reply 145

KloppOClock

14

Original post by ReeceFraser

Anyone got any hints on how to start dyanmic programmings?

look at the question and determine the following things

what should my destination be (commonly zero)
how high can my action be
how high can my state be.

also write what each column means, next to state for example, write how many units you have at the start

Reply 146

Asurat

17

Original post by KloppOClock

i dont understand what you mean by doing a forward flow and a back flow

E.g if there is an arc DF.
One flow augmenting route has a flow in the -> direction.
Another flow augmenting route on the same network has a flow in the <- direction (opposite). So one of them is a backflow.

I'm wondering if you can do this, or if you have to stick to one direction once you start flow augmenting.

Reply 147

KloppOClock

14

Original post by economicss

What would we do if there were 4 products instead of me, would the middle bit of the production table be the same structure? Thanks!

if there were 4 products, your second and third stage should be similar

Reply 148

KloppOClock

14

Original post by Asurat

E.g if there is an arc DF.
One flow augmenting route has a flow in the -> direction.
Another flow augmenting route on the same network has a flow in the <- direction (opposite). So one of them is a backflow.

I'm wondering if you can do this, or if you have to stick to one direction once you start flow augmenting.