Hello R list, I am have question about sampling unique coordinate values.
Here's how my data looks like > dat <- cbind(x1 = rep(1:5, 3), x2 = rep(c(3.7, 2.9, 5.2), each=5)) > dat x1 x2 [1,] 1 3.7 [2,] 2 3.7 [3,] 3 3.7 [4,] 4 3.7 [5,] 5 3.7 [6,] 1 2.9 [7,] 2 2.9 [8,] 3 2.9 [9,] 4 2.9 [10,] 5 2.9 [11,] 1 5.2 [12,] 2 5.2 [13,] 3 5.2 [14,] 4 5.2 [15,] 5 5.2 If I sampled (1, 3.7), then, I don't want (1, 2.9) or (2, 3.7). I want to avoid either the first or second coordinate repeated. It leads to undefined matrix inversion. I thought of using sampling(), but not sure about applying it to a data frame. Thanks in advance, Mike [[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 http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.