Re: [R] enumerate subsets
lamack lamack 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.
Best Regards.
ps. It is not a homework. I never posted homework in this list.
The easiest way is probably to generate the numbers 1:(2^n-1), convert
them to binary, and use the bits to indicate in/out status.
E.g.,
n - 4
x - 1:(2^n-1)
sapply(1:n, function(i) {r - as.logical(x%%2) ; x - x%/%2 ; r})
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Re: [R] enumerate subsets
Can you give a small example of what you data looks like and what you think the output should be. Have you looked at 'combn'? On Sun, Jul 20, 2008 at 4:33 PM, lamack lamack [EMAIL PROTECTED] 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. Best Regards. ps. It is not a homework. I never posted homework in this list. LL _ Cansado de espaço para só 50 fotos? Conheça o Spaces, o site de relac[[elided Hotmail spam]] [[alternative HTML version deleted]] __ R-help@r-project.org mailing list 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. -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? __ R-help@r-project.org mailing list 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.
Re: [R] enumerate subsets
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 abcd 2 NAbcd 3 a NAcd 4 NA NAcd 5 ab NAd 6 NAb NAd 7 a NA NAd 8 NA NA NAd 9 abc NA 10 NAbc NA 11a NAc NA 12 NA NAc NA 13ab NA NA 14 NAb NA NA 15a NA NA NA 16 NA NA NA NA On Sun, Jul 20, 2008 at 4:33 PM, lamack lamack [EMAIL PROTECTED] 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. Best Regards. ps. It is not a homework. I never posted homework in this list. LL _ Cansado de espaço para só 50 fotos? Conheça o Spaces, o site de relac[[elided Hotmail spam]] [[alternative HTML version deleted]] __ R-help@r-project.org mailing list 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. __ R-help@r-project.org mailing list 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.
