The textbook uses an extra argument 'size'. If you do the same, it should work.
matrix(sample(1:10, size = 5 * 10, replace=TRUE), 5, 10, byrow=TRUE) On Thu, Mar 13, 2025, 17:23 Kevin Zembower via R-help <r-help@r-project.org> wrote: > Hello, all, > > I'm learning to do randomized distributions in my Stats 101 class*. I > thought I could do it with a call to sample() inside a matrix(), like: > > > matrix(sample(1:10, replace=TRUE), 5, 10, byrow=TRUE) > [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] > [1,] 8 2 3 1 8 2 8 8 9 8 > [2,] 8 2 3 1 8 2 8 8 9 8 > [3,] 8 2 3 1 8 2 8 8 9 8 > [4,] 8 2 3 1 8 2 8 8 9 8 > [5,] 8 2 3 1 8 2 8 8 9 8 > > > > Imagine my surprise to learn that all the rows were the same > permutation. I thought each time sample() was called inside the matrix, > it would generate a different permutation. > > I modeled this after the bootstrap sample techniques in > https://pages.stat.wisc.edu/~larget/stat302/chap3.pdf. I don't > understand why it works in bootstrap samples (with replace=TRUE), but > not in randomized distributions (with replace=FALSE). > > Thanks for any insight you can share with me, and any suggestions for > getting rows in a matrix with different permutations. > > -Kevin > > *No, this isn't a homework problem. We're using Lock5 as the text in > class, along with its StatKey web application. I'm just trying to get > more out of the class by also solving our problems using R, for which > I'm not receiving any class credit. > > ______________________________________________ > 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 > https://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ 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 https://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
