ggplotting时，有序数据框的顺序不同

问题描述

这是我经常遇到的问题，我只需要帮助解决此问题即可.我正在尝试使用ggplot绘制排序的数据框.但是，该图的排序方式与我在数据框中的排序方式不同.

This is a problem I run into frequently, and I just need help sorting this issue out. I'm trying to plot a sorted dataframe with ggplot.However, the plot is not ordered the way it is ordered in my dataframe.

一个简单的例子来说明我的问题:

Simple example to illustrate my problem:

value <- c(5,8,9,11,3)
Attribute <- c("a", "b", "c","d","e")
my.order <- as.factor(c(4,3,2,1,5))
my.df <- data.frame(Attribute,value,my.order)
my.df
#  Attribute value my.order
#1         a     5        4
#2         b     8        3
#3         c     9        2
#4         d    11        1
#5         e     3        5

然后我按my.order对数据框Attribute列进行排序

Then I order the dataframe , Attribute column by my.order

my.df.ordered <- my.df[with(my.df, order(my.order, Attribute)), ]

my.df.ordered

 # Attribute value my.order
#4         d    11        1
#3         c     9        2
#2         b     8        3
#1         a     5        4
#5         e     3        5

这很好，但是当我尝试用ggplot绘制时，属性再次按字母顺序排序....

This is all fine, but when I try to plot this with ggplot, the Attributes are ordered alphabetically again....

ggplot(my.df.ordered, aes(x=Attribute,y=value))+ geom_point()+ coord_flip()

请帮助?

推荐答案

您正在寻找 reorder 函数:

my.order <- c(4,3,2,1,5)
my.df <- data.frame(Attribute,value,my.order)

ggplot(my.df, aes(x=reorder(Attribute, my.order),y=value)) + 
    geom_point() + 
    coord_flip()

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