Dear Nicolas, > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > [EMAIL PROTECTED] > Sent: Thursday, January 13, 2005 7:51 AM > To: r-help@stat.math.ethz.ch > Subject: [R] random samples > > hi, > I am encoutering a very little problem that seemed to be so > easy to solve.... > I need to divide the array > > > A<-c(1:200)
Note that A is a vector, not an array, and that you don't need c(). > > into two subsets at random. Therefore I use the function > "sample" in R: > > > S<-sample(A,100) > > for a random sample of size 100. Then I need the values in A > that are not selected in S to be put in another array, there > is my problem! > Is there anyway to do this with a function of R or should I > do one by myself? > If in your application, as in your example, the elements of A are all distinct, then setdiff(A, S) will give you what you want. If the elements of A are not distinct, then you could sample the indices of the elements and proceed as above, indexing A by the two vectors of indices. I hope this helps. John > Thanks in advance > Nicolas > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
