R:有两组的条形图，其中一组堆叠 [英] R: bar plot with two groups, of which one is stacked

问题描述

在R中创建条形图时遇到一个小问题.有3个变量:

I've encountered a small problem when creating a bar plot in R. There are 3 variables:

a <- c(3,3,2,1,0)
b <- c(3,2,2,2,2)
c <- 0:4

条形图应按'a'和'c'分组，并且'b'应堆叠在'a'的顶部.单独进行分组和堆叠很简单:

The bar plot should be grouped by 'a' and 'c', and 'b' should be stacked on top of 'a'. Doing the grouping and stacking seperately is straightforward:

barplot(rbind(a,c), beside=TRUE)
barplot(rbind(a,b), beside=FALSE)

如何在一张图表中同时完成两项操作?

How can you do both at once in one graph?

推荐答案

执行此操作需要考虑barplot如何绘制堆积的条形.基本上，您需要在适当的地方为它提供一些值为0的数据.使用您的数据:

Doing this requires thinking about how barplot draws stacked bars. Basically, you need to feed it some data with 0 values in appropriate places. With your data:

mydat <- cbind(rbind(a,b,0),rbind(0,0,c))[,c(1,6,2,7,3,8,4,9,5,10)]
barplot(mydat,space=c(.75,.25))

要了解引擎盖下发生了什么，请查看mydat:

To see what's going on under the hood, take a look at mydat:

> mydat
  [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
a    3    0    3    0    2    0    1    0    0     0
b    3    0    2    0    2    0    2    0    2     0
     0    0    0    1    0    2    0    3    0     4

在这里，您正在用三个值(a的值，b的值，c的值)绘制每个条形图. mydat矩阵的每一列都是一个条形图，对其进行了排序，以使ab条形图适当地散布在c条形图上.您可能想要在间距和颜色上玩转.

Here, you're plotting each bar with three values (the value of a, the value of b, the value of c). Each column of the mydat matrix is a bar, sorted so that the ab bars are appropriately interspersed with the c bars. You may want to play around with spacing and color.

在R-help 时间 没有

Apparently versions of this have been discussed on R-help various times without great solutions, so hopefully this is helpful.

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