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#1 2014-08-12 08:58:34

mohunkey
Member
Registered: 2014-08-12
Posts: 12

the Combinations and permutations calculator

Good evening people,
I'm looking at the calculator to help me solve a problem me and a friend have been having it works with what I need it gives me all of the possible combinations but I am looking for all of the unique combinations is there a way of filtering all the results just to get those please.

cheers for any help
Mohunkey

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#2 2014-08-12 09:28:02

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

Hi mohunkey;

It would help if you posted the problem.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#3 2014-08-12 17:54:03

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

hey bobbym
yeah the problem is me and a mate are thinking about starting a race seriers and we are going to have like 20 competitors ruffly and only about 5,6 that can run at a time but over the weeks we want each competitor to run every other competitor once. yeah I also know that some races will have less racers in than others but that doesn't matter
could you please help cheers

mohunkey

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#4 2014-08-12 20:20:08

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

Is it 5 or is it 6?


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#5 2014-08-12 21:05:41

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

Lets say six atm just want to know how to work it so if we get more people enter we can add them easily
cheers
mohunkey

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#6 2014-08-12 21:15:56

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

Is this something like a tournament?


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#7 2014-08-12 21:27:03

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

Yeah ital be you get so many points for a win and less for each place after but when ever I've tried to workit out we end up with racers who have raced twice.
cheers
mohunkey

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#8 2014-08-13 03:37:32

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

hey bobbym is this something you would be able to help with or pint me in the correct direction please
cheers Mohunkey

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#9 2014-08-13 03:46:58

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

Hi;

So far I do not understand the problem well enough to try to answer it.

I sure could use an example of what you are trying to do. Can you put together a smaller example than the real one?


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#10 2014-08-13 04:03:44

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

Basically we have a number of number of competitors (c) they have a race with any combination of the other competitors up to six at a time and each week they have a race a different set of people so what I was wondering is there a way using maths or anything of easily picking the racers so they race each other once in the compleat tornament
so say you have racers a-i
week one
race 1 a,b,c
race 2 d,e,f
race 3 g,h,i
week two
race 1 a,e,i
race 2 b,f,g
race 3 c,d,h
and so on
but unlike with small combinations like this it is really difficult when you have a large number to choose from to get each racer to have a race each week who hasn't raced a person before.

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#11 2014-08-13 04:28:11

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

Hi;

Okay, I will look at it.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#12 2014-08-13 04:37:13

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

Cheers thank you

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#13 2014-08-13 21:01:04

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

Hi;

The nearest I can understand your problem is as a progressive dinner. Some of them have solutions and some do not. Many have not been figured yet, all require a computer to enumerate them.

For the a,b,c,d,e,f,g,h,i example we can relabel it 1,2,3,4,5,6,7,8,9 and it takes 4 days.
Day 1
6 4 8
3 9 7
5 1 2

Day 2
1 8 3
4 2 9
5 7 6

Day 3
1 9 6
4 3 5
8 7 2

Day 4
9 5 8
4 7 1
6 3 2


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#14 2014-08-13 21:04:47

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

Yeah how did you do it just go through them all
cheers
mohunkey

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#15 2014-08-13 21:08:05

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

It was even easier than that, I just copied.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#16 2014-08-13 21:20:46

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

But it just listed every combination
123
124
125
126
127
128
and so on

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#17 2014-08-13 21:27:43

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

No, it did not because that would have 1 racing with 2 many times. This progressive dinner has each one racing against every other one just once.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#18 2014-08-13 21:29:17

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

No I ment when I did it sorry.
where did you get your combinations from please.
cheers
mohunkey

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#19 2014-08-13 21:32:06

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

I copied it from a list of all the known progressive dinners. As I have said not all of them have a solution, some are impossible and some we just do not know.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#20 2014-08-13 21:51:57

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

Ok so I should search for progressive dinners

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#21 2014-08-13 21:53:43

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

I can direct you to the sites where the research is already under way. There are many tables, if you have trouble understanding how they work come back here. Is that acceptable?


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#22 2014-08-13 21:56:48

mohunkey
Member
Registered: 2014-08-12
Posts: 12

Re: the Combinations and permutations calculator

Yeah that is fantastic cheers for all ya help
cheers

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#23 2014-08-13 22:04:14

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: the Combinations and permutations calculator

Einstein wrote:

Creativity is knowing how to hide your sources

The one quote that establishes Einstein as a true genius.

http://www.mathpuzzle.com/MAA/54-Golf%2 … l#g36o4d11

http://faculty.mercer.edu/schultz_sr/so … olfer.html

http://web.archive.org/web/200503081154 … /~wh/golf/


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

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