问题
This is a duplicate question to this, except for R rather than Python.
I'd like to identify groups of contiguous (some people call them continuous) integers in a list, where duplicate entries are treated as existing within the same range. Therefore:
myfunc(c(2, 3, 4, 4, 5, 12, 13, 14, 15, 16, 17, 17, 20))
returns:
min max
2 5
12 17
20 20
Although any output format would be fine. My current brute-force, for-loop method is pretty slow.
(Apologies if I could have easily re-interpreted the Python answer and I'm being stupid!)
回答1:
Just use diff:
x = c(2, 3, 4, 4, 5, 12, 13, 14, 15, 16, 17, 17, 20)
start = c(1, which(diff(x) != 1 & diff(x) != 0) + 1)
end = c(start - 1, length(x))
x[start]
# 2 12 20
x[end]
# 5 17 20
来源：https://stackoverflow.com/questions/16324897/finding-groups-of-contiguous-numbers-in-a-list