R help - Sep 2009 - Function for all 2^N subsets of N

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
------------------------------ XFMail ------------------------------

Maybe

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

does what you want.

  Best regards  --  Gerrit

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AOR Dr. Gerrit Eichner             Mathematical Institute, Room 305 E
gerrit.eichner at math.uni-giessen.de   Justus-Liebig-University Giessen
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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.
>
> --------------------------------------------------------------------
> 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
> ------------------------------ XFMail ------------------------------
>
> ______________________________________________
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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.
>

My first thought was the odometer() function, which is often useful for
tasks like this.  To my surprise it is not a part of the current R.  
  I wonder why?  It shouldn't be an Splus copyright issue as this was a
part of my original S distribution (before Splus even existed), and used
in an example in one of the early books.
  Terry T