在列表中查找连续数字组 [英] Finding groups of contiguous numbers in a list

问题描述

这是此的重复问题，用于R而不是Python.

This is a duplicate question to this, except for R rather than Python.

我想在列表中标识出连续的整数组(有些人称它们为连续的)，其中重复的条目被视为存在于同一范围内.因此:

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))

返回:

min  max
2    5
12   17
20   20

尽管任何输出格式都可以.我当前的蛮力for循环方法非常慢.

Although any output format would be fine. My current brute-force, for-loop method is pretty slow.

(很抱歉，如果我能轻松地重新解释Python答案并且我很愚蠢！)

(Apologies if I could have easily re-interpreted the Python answer and I'm being stupid!)

推荐答案

只需使用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

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