I think before for a sensitivty analysis I suggested just using runiform and an aribtrary cutoff. You could keep logically "or"-ing your prior hits
Run runiform of the needed length, do vector boolean ops from exclusion criteria to get ones you want, get a logical vector or true/false, select from your array using this, and update whatever exclusion criteria you have. http://www.r-help.com/list/85/746849.html ---------------------------------------- > Date: Tue, 30 Nov 2010 16:04:19 -0500 > From: jholt...@gmail.com > To: emma.r.mo...@gmail.com > CC: r-help@r-project.org > Subject: Re: [R] excluding factors from sampling > > You could just sample the complete group and then draw off the top the > number you want; the next time you go to the well, they are missing > and you get something from the remainder. You can also do 'setdiff' > to get the difference. > > On Tue, Nov 30, 2010 at 12:45 PM, Emma Moran wrote: > > Hello, > > > > I am trying to write a function that first requires randomly sampling items > > from a set of factors. I need to be able to sample from that same set of > > factors, but exclude the ones that have already been sampled previously. For > > example, suppose I have a set of items a-j (a,b,c,d,e,f,g,h,i, and j) and > > randomly sample a, c, and f from that group. How do I sample again from the > > larger group (a-j) but exclude the items (a,c,f) that I have already > > sampled. I want this to be a function, so I don't want to just manually > > exclude a,c, and f. > > > > Thanks! > > > > -- > > Emma Moran > > Washington University in St Louis > > Biology Department > > McDonnell Hall Rm 419 > > One Brookings Drive, St. Louis, MO 63130 > > emo...@wustl.edu > > > > [[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 that 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. ______________________________________________ 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.
