R experts, Hello, I am trying to sample a vector 1:40 without replacement such that no element in the new vector is within 7 units of either of its immediate neighbors. This is part of a larger program I am working on. The following code works well about 65 % of the time (14/40). The problem I encounter happens when the last element remaining to be sampled from the vector STRATA is within 7 digits +- of the last element in the vector s1, at which point an infinite loop occurs. At least that's what I think is happening. Any help would be greatly appreciated.
Thank you, Mike require(IRanges) STRATA <- 1:40 s1 <- sample(STRATA, 1) for (i in seq(from = 1, to = 39, by = 1)){ repeat{ tmp <- sample(STRATA, 1) if (!any(s1 == tmp) & !any(as.vector(IRanges(s1[length(s1)]-7, s1[length(s1)]+7)) %in% tmp)) break } s1 <- c(s1,tmp) } s1 ______________________________________________ R-help@r-project.org mailing list 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.