I believe you mean c(sample(1:3,3), sample(1:3, 2, replace = TRUE) is that right?
However, we cannot see the combination like 33312. This is a problem. -----Original Message----- From: Erik Iverson [mailto:er...@ccbr.umn.edu] Sent: Wednesday, August 18, 2010 7:56 PM To: Chen,Shaofei Cc: r-help@r-project.org Subject: Re: [R] sample() question On 08/18/2010 07:51 PM, Chen,Shaofei wrote: > Consider an example: > There are 3 stores (1,2,3), and 5 customers. Each store must have at least > one customer. Thus a possible combination is 11213. On the other hand, a > combination 22333 is not what I want > > I have considered your solution earlier, but in this case, first three > customers have to go to store 123 in sequence, and the randomness has been > reduced. You are right, the sampling procedure is not totally random, but I > want to be as random as possible. So just use my previous solution and permute the result using sample. > > Thanks! > > -----Original Message----- > From: Erik Iverson [mailto:er...@ccbr.umn.edu] > Sent: Wednesday, August 18, 2010 7:11 PM > To: Chen,Shaofei > Cc: r-help@r-project.org > Subject: Re: [R] sample() question > > On 08/18/2010 06:58 PM, Chen,Shaofei wrote: >> Hello all, >> >> >> >> I have a question regarding sample() in R. For example, I have a set: >> >> set<- c(2,3,5) >> >> and I want to draw 5 samples from this set, so replacement is true: >> >> m<- sample(set, 5, replace=TRUE) >> >> However here comes a problem, for example, I will have (2,3,3,2,5), but I >> will also get (3,3,5,5,3) in some cases. This means element 2 has not > been >> sampled in this case. >> >> The way I want to do is to random sample with replacement, but all > elements >> have to be sampled. >> >> Any solutions? > > Well, if all elements have to be sampled once, then those 3 elements > will not be random, since they must be present. > > So you're really only sampling 2 elements from the set, so just do that. > > c(1:3, sample(set, 2, replace = TRUE) > > > although I really wonder what you're trying to do here? > ______________________________________________ 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.
