r - 如何确定直方图的区间

Question

我正在尝试一个简单的直方图

hist(c(-2,-1,0,1,2))

对于上述代码，直方图的频率等于 -2 到 -1 的 2。

我不太明白 R 如何将值放置在它给出的图中的区间内。我的意思是，这里的频率（y 轴）不应该一直等于 1，因为没有重复？

另外，我不太明白该范围是如何工作的，是包含上限/包含下限还是..？[,) 或 (,] 或 [,] 或 (,) ..？

Answer 1

All your questions can be answered by reading the help file for hist, help('hist') or ?hist

There are arguments include.lowest and right which both default to TRUE

Quoting from the help

-include.lowest

logical; if TRUE, an x[i] equal to the breaks value will be included in the first (or last, for right = FALSE) bar. This will be ignored (with a warning) unless breaks is a vector.

-right

logical; if TRUE, the histogram cells are right-closed (left open) intervals.