使用ggplot2时如何更改箱线图的顺序? [英] How to change order of boxplots when using ggplot2?

问题描述

这个问题来自另一个一个.我无法在那里实施答案.

This question follows from this other one. I was unable to implement answers there.

定义:

df2 <- data.frame(variable=rep(c("vnu.shr","vph.shr"),each=10),
        value=seq(1:20))

剧情:

require(ggplot2)
qplot(variable,value, data=df2,geom="boxplot")+
geom_jitter(position=position_jitter(w=0.1,h=0.1))

我希望以相反的顺序绘制箱线图(例如，一个在右在左，依此类推).

I would like to have the boxplots in the reverse order (e.g. one in right on left and so on).

我尝试了各种使用levels、ordered、relevel、rev等重新排序因子的方法，但我似乎无法正确理解语法.

I have tried various ways of reordering the factors using levels, ordered, relevel, rev and so on, but I simply cannot seem to get the syntax right.

推荐答案

你有没有试过这个:

df2$variable <- factor(df2$variable,
    levels = c('vph.shr','vnu.shr'),ordered = TRUE)

我刚刚在那里挑选了一个订单，因为我的系统配置与我怀疑的您的略有不同，所以我的默认订单"可能会有所不同.但是你可以在指定它们时切换级别的位置.

I just picked an ordering there, since my system is configured slightly differently than yours I suspect, so my 'default ordering' may differ. But you can just switch the position of levels when specifying them.

其他一些选择，取决于您的口味:

A few other options, depend on your tastes:

为了反转当前的顺序:

factor(df2$variable,levels = rev(levels(df2$variable)),ordered = TRUE)

或者如果您不想手动输入每个级别，您可以使用子集来指定特定的顺序:

or you can use subsetting to specify a specific ordering if you don't want to type out each level by hand:

factor(df2$variable,levels = levels(df2$variable)[1:2],ordered = TRUE)

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