我正在尝试用ggplot2绘制一个饼图.我的代码如下所示.
df <- data.frame(
variable = c("australia","hungary","germany","france","canada"),
value = c(632,20,491,991,20)
)
ggplot(df, aes(x = "", y = value, fill = variable)) +
geom_bar(width = 1, stat = "identity") +
scale_fill_manual(values = c("red", "yellow","blue", "green", "cyan")) +
coord_polar(theta = "y") +
labs(title = "pie chart")
我想显示百分比值.我怎样才能做到这一点？