To pick random elements to sample, you can just use the sample function sample(1:5,3,replace=T/F) # pick true or false as needed for your data.
If you replicate this, you should have no problem. replicate(100,function() return(sample(1:5,3,replace=T/F))) This will be plenty fast, but if you get into very large scale boot strapping, you might want to vectorize the whole thing. That's easily done with replace = T (just take 3*100 samples and then convert the output vector to a matrix) but I'm not sure its quite as easy with replace = F. Hope this helps, Michael On Wed, Aug 10, 2011 at 2:37 PM, Vikram Chhatre <crypticline...@gmail.com>wrote: > Hello, > > I am a R beginner and hoping to obtain some hints or suggestions about > using permutations to sort a data set I have. > > Here is an example dataset: > > > Ind1 11 00 12 15 28 > Ind2 21 33 22 67 52 > Ind3 22 45 21 22 56 > Ind4 11 25 74 77 42 > Ind5 41 32 67 45 22 > > This will be read into a variable using read.table. What I want to do > is permute these individuals and every time pick 3 individuals and > write them to a new variable. I want to do this 100 times so that in > the end I will have 100 tables containing data for 3 individuals each. > The data (for individuals) itself is not to be permuted, rather the > selection of individuals. > > I am guessing this is probably trivial to do. But I would appreciate > any advice on this matter. > > Thank you. > Vikram > > ______________________________________________ > 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. > [[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.
