R图形:为堆积条形图添加标签 [英] R graphics: Add labels to stacked bar chart

问题描述

我正在寻找一种使用 R 的基本绘图功能将标签(即绝对值)添加到堆叠条形图中的方法.标签应该在堆叠条内.

I am looking for a way to add labels, i.e. absolute values, into a stacked bar chart using the basic plot functions of R. The labels should be inside the stacked bars.

谢谢！

推荐答案

barplot 将返回条形的中间 x 位置，所以你可以这样做

barplot will return the mid x position of the bars, so you could do

mydata <- matrix(c(10, 21, 22, 33, 45, 23, 22, 43, 33), nrow=3)

# b will contain the x midpoints of the bars
b <- barplot(mydata)

# This will write labels in the middle of the bars, horizontally and vertically
text(b, colMeans(mydata), c("Label1", "Label2", "Label3"))

# This will write labels in the middle of the middle block
text(b, mydata[1,]+mydata[2,]/2, c("LabelA", "LabelB", "LabelC"))

重新阅读您的问题，我认为这是您想要的(或者可能不是，但我还是会写它:D)

re-reading your question, I think this is what you want (or maybe not, but I'll write it anyways :D)

# Find the top y position of each block 
ypos <- apply(mydata, 2, cumsum)
# Move it downwards half the size of each block
ypos <- ypos - mydata/2
ypos <- t(ypos)

text(b, ypos, mydata)

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