查找最近的较小数字 [英] Find nearest smaller number

问题描述

我有一个数字向量

f <- c(1, 3, 5, 8, 10, 12, 19, 27)

我想将向量中的值与另一个数字进行比较，并找到最接近的较小值.

I want to compare the values in the vector to another number, and find the closest smaller value.

例如，如果输入数字是 18，那么向量中最接近的较小值是 12(向量中的位置 6).如果输入是 19，那么结果应该是值 19，即索引 7.

For example, if the input number is 18, then the closest, smaller value in the vector is 12 (position 6 in the vector). If the input is 19, then the result should be the value 19, i.e. the index 7.

推荐答案

我认为这个答案很简单:

I think this answer is pretty straightforward:

f <- c(1,3,6,8,10,12,19,27)
x <- 18

# find the value that is closest to x
maxless <- max(f[f <= x])
# find out which value that is
which(f == maxless)

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