Dale Steele wrote:
I would like to randomly shuffle a distance object, such as the one
created by ade4{dist.binary} below. My first attempt, using
sample(jc.dist) creates a shuffled vector, losing the lower triangular
structure of the distance object. How can I Ishuffle the lower
triangular part of a distance matrix without losing the structure?
Thanks. --Dale
x1 <- c(rep(0,4),1)
x2 <- c(rep(0,2),rep(1,3))
x3 <- c(rep(1,3), rep(0,2))
X <- rbind(x1,x2,x3)
X
X <- as.data.frame(X)
library(ade4)
jc.dist <- dist.binary(X, method=1)
sample(jc.dist)
Convert to the full matrix, shuffle that and then convert back to a dist
object.
jc.mat <- as.matrix(jc.dist)
shuff <- sample(nrow(jc.mat))
jc.shuff <- as.dist(jc.mat[shuff, shuff])
HTH
Gavin
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.