在R中排序向量中查找值的索引 [英] Find index of value in a sorted vector in R

问题描述

我在R中有一个唯一整数的有序向量，并且我想找到最接近但小于或等于某个值的元素的索引.例如，对于向量4 8 15 16 23 42和搜索值17，我希望函数返回索引16的4.在Python中，我会使用 bisect 模块. R中有类似的东西吗?

I have an ordered vector of unique integers in R and I want to find the index of the element closest to but less than or equal to some value. For example, for the vector 4 8 15 16 23 42 and the search value 17, I would like the function to return 4, the index of 16. In Python, I would use bisect module. Is there anything similar in R?

推荐答案

Base R提供了

Base R provides findInterval which implements a binary search:

findInterval(17, c(4, 8, 15, 16, 23, 42))

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@Khashaa已经在评论中提到了这一点.

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@Khashaa already mentioned this in a comment.

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