D1 (Decision 1) 17 May 2013 Official Thread

Reply 580

niki135

2

Thanks guys! I'll write it in and cross it out :smile:

Good luck for tomorrow - major cramming is underway :/

Reply 581

Dilzo999

19

No you just write the possibilities and if it's higher then you add them in. If you follow the algorithm perfectly then you should get exactly the same in the markscheme. Also does it matter in djikesta if you start at 1 or 0?

Reply 582

Skilled

16

Original post by niki135

Can someone PLEASE answer this question:

When you're doing Dijkstra's algorithm and you have, let's say, point G with a working value of 15. Then the second working value you do is bigger than 15, do you still write it in and cross it out? Or do you just leave it out completely?!

Thank you! x

I usually write it in a bracket

Reply 583

Fortitude

16

Hey guys, when drawing activity networks I know we should start from 0 but why have they started from 1 in the Jan 2009 Q3 paper?

Reply 584

Vaner

1

Original post by Fortitude

Hey guys, when drawing activity networks I know we should start from 0 but why have they started from 1 in the Jan 2009 Q3 paper?

Exactly this??

In book, it's from zero, but from 1 in mark scheme. My teacher uses 1 as well.

Reply 585

Fortitude

16

Original post by Vaner

Exactly this??

In book, it's from zero, but from 1 in mark scheme. My teacher uses 1 as well.

I know right, it's specifically 0 in the book, I mean they've even called it the source node. :confused:

Reply 586

posthumus

20

Original post by Fortitude

I know right, it's specifically 0 in the book, I mean they've even called it the source node. :confused:

EDIT: Just realized you guys may be talking about activity networks :colondollar:

my bad

(edited 10 years ago)

Reply 587

Epic Flawless

Original post by posthumus

EDIT: Just realized you guys may be talking about activity networks :colondollar:

my bad

Well, you're not totally wrong; in past papers, the source node for activity networks is labelled 1, despite what the textbook says...

Reply 588

Fortitude

16

Original post by posthumus

EDIT: Just realized you guys may be talking about activity networks :colondollar:

my bad

Ok I'm confused when you start an activity network, you start off with a node & that node is labelled 0 & then the line which connects from it is labelled A & this line connects to a node which is labelled 1.

Reply 589

yugiohtheawesome

Does anyone think scheduling is going to come up instead of a Gantt chart? I really hate them :frown:

Reply 590

posthumus

20

Original post by Fortitude

Ok I'm confused when you start an activity network, you start off with a node & that node is labelled 0 & then the line which connects from it is labelled A & this line connects to a node which is labelled 1.

I don't even know why it even matters ??? :confused:

I've never labelled them, I'd be surprised if we do get marked on our labeling.

Original post by yugiohtheawesome

Does anyone think scheduling is going to come up instead of a Gantt chart? I really hate them :frown:

I feel your pain, unfortunately scheduling is quite likely to come up... it's not too bad, just too time consuming ! So get as much practice as you can today, if you feel that's a weakness :smile:

Reply 591

Fortitude

16

Original post by yugiohtheawesome

Does anyone think scheduling is going to come up instead of a Gantt chart? I really hate them :frown:

Have no idea, it came up this time last year but it was after drawing a Gantt chart, I have no idea on how'd you draw a scheduling diagram straight from CPA. :s-smilie:

Reply 592

Fortitude

16

Original post by posthumus

I don't even know why it even matters ??? :confused:

I've never labelled them, I'd be surprised if we do get marked on our labeling.

I feel your pain, unfortunately scheduling is quite likely to come up... it's not too bad, just too time consuming ! So get as much practice as you can today, if you feel that's a weakness :smile:

I don't know, it probably doesn't matter because if it did, they would've mentioned it specifically in the mark scheme which they didn't so everything's ok :smile:

How would draw a scheduling diagram straight from a CPA w/o a Gantt chart? :s-smilie:

Reply 593

otrivine

14

someone please confirm when drawing the activity network we start from 0 yes or no?

THANK YOU :smile:

Reply 594

Skilled

16

Original post by otrivine

someone please confirm when drawing the activity network we start from 0 yes or no?

THANK YOU :smile:

yes

Reply 595

posthumus

20

Original post by Fortitude

I don't know, it probably doesn't matter because if it did, they would've mentioned it specifically in the mark scheme which they didn't so everything's ok :smile:

How would draw a scheduling diagram straight from a CPA w/o a Gantt chart? :s-smilie:

By looking at your early/late time diagram (the one with nodes). It's actually pretty tricky and time consuming... as you would expect :redface:

It came up last year I think, I remember my brother telling me it threw everyone away ... and most people did gantt charts :tongue:

so hopefully it won't come up tomorrow :smile:

since it already did last year.

EDIT: Oh really they had to draw both gantt chart & scheduling ? I think if they told us to do scheduling straight away, that would be pretty immoral ... it has been asked before though :tongue:

though drawing both charts is highly time consuming !

EDIT no.2 : Just checked they didn't ask to draw gantt chart .... only scheduling ? The good thing about that is, unlikely to come up again tomorrow :smile:

(edited 10 years ago)

Reply 596

Coffeewaffee

1

Original post by otrivine

someone please confirm when drawing the activity network we start from 0 yes or no?

THANK YOU :smile:

With activity networks, the leftmost box will always have [0|0] If it isn't, then you've messed up somewhere.

Reply 597

Skilled

16

[COLOR="#FF0000" ]When it gives you an equation eg. 6x + 9y = P max, then does the graph cross at (0,6) and (9,0) ? is it always the coordinates of each other? Thanks