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
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