From: Gabor Grothendieck <ggrothendieck_at_gmail.com>

Date: Sun, 20 Jul 2008 17:24:56 -0400

15 a <NA> <NA> <NA>

16 <NA> <NA> <NA> <NA>

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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. Received on Sun 20 Jul 2008 - 21:29:51 GMT

Date: Sun, 20 Jul 2008 17:24:56 -0400

Try this replacing letters[1:4] with your set:

*> do.call(expand.grid, as.data.frame(rbind(letters[1:4], NA)))
*

V1 V2 V3 V4 1 a b c d 2 <NA> b c d 3 a <NA> c d 4 <NA> <NA> c d 5 a b <NA> d 6 <NA> b <NA> d 7 a <NA> <NA> d 8 <NA> <NA> <NA> d 9 a b c <NA> 10 <NA> b c <NA> 11 a <NA> c <NA> 12 <NA> <NA> c <NA> 13 a b <NA> <NA> 14 <NA> b <NA> <NA>

15 a <NA> <NA> <NA>

16 <NA> <NA> <NA> <NA>

On Sun, Jul 20, 2008 at 4:33 PM, lamack lamack <lamac_k_at_hotmail.com> wrote:

*>
*

> Dear all, is there a R function that enumerate a partition of a vector of size n? (of course for n not very large).

*> I would like enumerate all the (2 power n)-1 sub-sets. (2 power n)-1 since (2 power n) includes de empty subset.
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**> ps. It is not a homework. I never posted homework in this list.
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