使用ggplot2在x轴上以间隔绘制图计数

Question

c1 <- c("p2","p3","p1","p2","p1","p3","p4","p4","p4","p1","p1","p2","p2","p3","p4","p2","p1","p4","p3","p3")
c2 <- c(41,146,79,107,131,127,32,88,119,148,32,65,36,23,44,76,100,98,121,104)

df <- data.frame(c1=c1, c2=c2)

我正在尝试在ggplot2中创建一个堆积的条形图，其中x轴的间隔和y轴的计数

概念上是这样

ggplot(df, aes(x=c2.intervals, y=count.c2.occurrences, fill=c1)) + geom_bar()

其中c2.intervals可能是0-70, 71-100, 100-150

例如，对于间隔0-70，p1出现一次，p2 3次，p3一次，p4两次。这些将是图中第一个堆积列的计数。

解决此问题的最佳方法是什么？

Answer 1

您可以使用cut()来定义间隔。另外，根据您的描述，我假设您要使用fill = c1而不是fill = c2？

查看以下各项是否符合您的目的：

library(dplyr)
df %>%
  mutate(c2.intervals = cut(c2, breaks = c(0, 70, 100, 150))) %>%
  ggplot(aes(x = c2.intervals, fill = c1)) +
  geom_bar()