Question

此代码与ggplot2 0.9.3无法正常工作（与早期版本的ggplot2一起使用，请参阅here）。如果你建议解决这个问题我会非常感激。感谢

library(ggplot2)
p <- qplot(as.factor(dose), len, data=ToothGrowth, geom = "boxplot", color = supp) + theme_bw()
p <- p + labs(x="Dose", y="Response")
p <- p + stat_summary(fun.y = mean, geom = "point", color = "blue", aes(group=supp))
p <- p + stat_summary(fun.y = mean, geom = "line", aes(group = supp))
p <- p  + theme(axis.title.x = element_text(size = 12, hjust = 0.54, vjust = 0))
p <- p  + theme(axis.title.y = element_text(size = 12, angle = 90,  vjust = 0.25))
print(p)

修改这一行

p <- p + stat_summary(fun.y = mean, geom = "line", aes(group = supp))

产生以下警告

geom_path: Each group consist of only one observation. Do you need to adjust the group aesthetic?

Answer 1

此行为是ggplot2 0.9.3中的错误：https://github.com/hadley/ggplot2/issues/739

您可以使用ddply计算摘要来解决这个问题：

library(plyr)
tg <- ddply(ToothGrowth, c("dose", "supp"), summarise, len = mean(len))

library(ggplot2)
ggplot(ToothGrowth, aes(x=as.factor(dose), y=len, colour=supp)) +
    geom_boxplot() +
    geom_line(data=tg, aes(group=supp))

ggplot2 0.9.3的异常行为

1 个答案: