[R] Function for all 2^N subsets of N

[Gerrit Eichner]

Maybe

expand.grid( rep( list( 0:1), 10))

does what you want.

  Best regards  --  Gerrit

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On Tue, 1 Sep 2009, 
Ted.Harding at manchester.ac.uk wrote:

> Greetings all!
> I have been searching the Site for a function, say "subsets",
> such that for instance
>
>  subsets(10)
>
> would return a (say) matrix of indices to the 2^10 subsets of
> N items -- perhaps in the form of 2^10 rows each of which is
> 10 entries each either TRUE or FALSE. Or 1 or 0. Or ...
>
> I can of course write my own, using good old looping technology
> or similar, but it would be good to find one which did it quick
> and snappy, at the compiled level.
>
> A Site Search in Function on "all subsets" didn't seem to yield
> anything of the kind, which surprised me. Maybe I overlooked
> something ...
>
> (This is prompted by the recent "OT" discussion on "HT vs. HH",
> to which I want to respond later).
>
> With thanks,
> Ted.
>
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> E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
> Fax-to-email: +44 (0)870 094 0861
> Date: 01-Sep-09                                       Time: 09:09:09
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