计算 R 中某个值出现的次数 [英] Counting the number of occurrences of a value in R

问题描述

如果我在 R 中有一个数字向量.

If I have a vector of numbers in R.

numbers <- c(1,1, 2,2,2, 3,3, 4,4,4,4, 1)

我想返回一个向量，该向量提供该值沿向量累积出现的次数.即

I want to return a vector that provides the number of times that value has occurred cumulatively along the vector. I.e.

results <- c(1,2, 1,2,3, 1,2, 1,2,3,4, 3)

推荐答案

我们可以使用 ave 并通过与 'numbers' vector 分组来应用 seq_along

We can use ave and apply the seq_along by grouping with the 'numbers' vector

ave(numbers, numbers, FUN = seq_along)
#[1] 1 2 1 2 3 1 2 1 2 3 4 3

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