[R] Getting all possible combinations

[Bert Gunter]

ummm, Ista, it's 2^n.

Cheers,
Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Wed, Aug 23, 2017 at 8:52 AM, Ista Zahn <istazahn at gmail.com> wrote:
> On Wed, Aug 23, 2017 at 11:33 AM, Christofer Bogaso
> <bogaso.christofer at gmail.com> wrote:
>> Hi again,
>>
>> I am exploring if R can help me to get all possible combinations of
>> members in a group.
>>
>> Let say I have a group with 5 members : A, B, C, D, E
>>
>> Now I want to generate all possible unique combinations with all
>> possible lengths from that group e.g.
>>
>> 1st combination : A
>> 2nd combination : B
>> .....
>> 5th combination : E
>> 6th combination : A, B
>> 7th combination : B, C
>> ....
>> last combination: A, B, C, D, E
>>
>> Ideally, I have a fairly large group so am looking for some
>> programmatic way to generate all possible combinations.
>
> Be careful, the number of combinations grows pretty quickly. You can
> calculate the number ahead of time with
>
> sum(choose(n, 1:n))
>
> where n is the number of values in your group.
>
> --Ista
>
>>
>> Any help will be highly appreciated.
>>
>> Thanks for your time.
>>
>> ______________________________________________
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>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.