Hi I am not sure what you mean by sampling an index of a group of intervals. I will try to give an example: Let's assume I have a vector 1:1000000. Let's say I have 10 intervals of different but known length, say, c(4,6,11,2,8,14,7,2,18,32). For simulation purposes I have to sample those 10 intervals 1000 times. The requirement is, however, that they should be of those lengths and should not be overlapping. In short, I would like to obtain a 10x1000 matrix with sampled intervals.
Thanks Hadassa On Sun, Jul 19, 2009 at 9:48 PM, David Winsemius<dwinsem...@comcast.net> wrote: > > On Jul 19, 2009, at 1:05 PM, Hadassa Brunschwig wrote: > >> Hi, >> >> I hope I am not repeating a question which has been posed already. >> I am trying to do the following in the most efficient way: >> I would like to sample from a finite (large) set of integers n >> non-overlapping >> intervals, where each interval i has a different, set length L_i >> (which is the number >> of integers in the interval). >> I had the idea to sample recursively on a vector with the already >> chosen intervals >> discarded but that seems to be too complicated. > > It might be ridiculously easy if you sampled on an index of a group of > intervals. > Why not pose the question in the form of example data.frames or other > classes of R objects? Specification of the desired output would be > essential. I think further specification of the sampling strategy would also > help because I am unable to understand what sort of probability model you > are hoping to apply. > >> Any suggestions on that? >> >> Thanks a lot. >> >> Hadassa >> >> >> -- >> Hadassa Brunschwig >> PhD Student >> Department of Statistics > > > David Winsemius, MD > Heritage Laboratories > West Hartford, CT > > -- Hadassa Brunschwig PhD Student Department of Statistics The Hebrew University of Jerusalem http://www.stat.huji.ac.il ______________________________________________ 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.
