如何使用 r 计算向量中落在特定范围内的元素数量？

Question

假设我们有一个向量a = (10,23,57,37,59,25,63,33)并且我们想要计算区间10-19,20-29,30-39,40-49,50-59,60-69的频率10-19,20-29,30-39,40-49,50-59,60-69 . 输出应为向量形式，在本例中为(1,2,2,2,1) 。

Answer 1

Another base R solution is to use hist , ie,

hist(a,plot = FALSE,breaks = seq(10,70,by=10))$counts
# [1] 1 2 2 0 2 1

Answer 2

Here is the solution:

a <- c(10, 23, 57, 37, 59, 25, 63, 33)
low_val  <- 10
high_val <- 70
a_breaks <- seq(low_val, high_val, 10)
res <- cut(a, a_breaks, include.lowest = T)
as.vector(table(res))
[1] 1 2 2 0 2 1

Answer 3

We can use cut with table

table(cut(a, breaks = c(-Inf, seq(10, 70, by = 10), Inf)))

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Or another option is

table(findInterval, seq(10, 70, by = 10)))