> On 12 Dec 2014, at 18:00 , Kathryn Lord <kathryn.lord2...@gmail.com> wrote: > > Dear all, > > Suppose that I have natural numbers 1 through 28. > > Based on these numbers, choose 4 numbers 7 times without replacement and > make a 4 by 7 matrix, for example, > >> a1 > [,1] [,2] [,3] [,4] [,5] [,6] [,7] > [1,] 1 5 9 13 17 21 25 > [2,] 2 6 10 14 18 22 26 > [3,] 3 7 11 15 19 23 27 > [4,] 4 8 12 16 20 24 28 > > and again create another 4 * 7 matrix, say a2, in the same way; however, > every element of each column in a2 does not exist in any column of a1 like > this, e.g. > >> a2 > [,1] [,2] [,3] [,4] [,5] [,6] [,7] > [1,] 1 2 3 4 5 6 7 > [2,] 8 9 10 11 12 13 14 > [3,] 15 16 17 18 19 20 21 > [4,] 22 23 24 25 26 27 28 >> >
No comprendo... In which sense does e.g. "1" in the first column of a2 not exist in any column of a1???? -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
