R文档不建议使用饼图，它们的功能有限。作者在饼图上推荐条形图或点图，因为人们能够比卷更准确地判断长度。饼图由函数pie（x ，labels =）创建，其中x是一个非负数字向量，指示每个切片的面积，labels =记录切片名称的字符向量。
简单的饼图
# Simple Pie Chart
slices <- c(10, 12,4, 16, 8)
lbls <- c("US", "UK", "Australia", "Germany", "France")
pie(slices, labels = lbls, main="Pie Chart of Countries")
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带注释百分比的饼图
# Pie Chart with Percentages
slices <- c(10, 12, 4, 16, 8)
lbls <- c("US", "UK", "Australia", "Germany", "France")
pct <- round(slices/sum(slices)*100)
lbls <- paste(lbls, pct) # add percents to labels
lbls <- paste(lbls,"%",sep="") # ad % to labels
pie(slices,labels = lbls, col=rainbow(length(lbls)),
main="Pie Chart of Countries")
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3D饼图
plotrix软件包中的pie3D（）函数提供了3D爆炸饼图。
# 3D Exploded Pie Chart
library(plotrix)
slices <- c(10, 12, 4, 16, 8)
lbls <- c("US", "UK", "Australia", "Germany", "France")
pie3D(slices,labels=lbls,explode=0.1,
main="Pie Chart of Countries ")
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从数据框中创建带注释的派
# Pie Chart from data frame with Appended Sample Sizes
mytable <- table(iris$Species)
lbls <- paste(names(mytable), "\n", mytable, sep="")
pie(mytable, labels = lbls,
main="Pie Chart of Species\n (with sample sizes)")
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