ggplot2绘制饼图

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# 加载 ggplot2 包 library(ggplot2)   # 加载数据 data <- data.frame(category = c("A", "B", "C", "D"), value = c(10, 20, 30, 40))   # 绘制饼图 ggplot(data, aes(x = "", y = value, fill = category)) +   geom_bar(width = 1, stat = "identity") +   coord_polar("y", start = 0) +   theme_void()