ggplot2：在自由标度上反转每个方面的离散字符变量的顺序？ [英] ggplot2:Reversing the order of a discrete character variable for each facet on a free scale?

问题描述

我想绘制一个刻面的ggplot2点图。 x轴是连续的，y轴是动物的列表。根据饮食行为绘制并刻画两个变量。

y轴是免费的，因为每只动物只出现在一个饮食行为类别中。

<$ p



$首先清理数据集：
msleep.noNA< - msleep [！is.na（msleep $ vore） ，]
msleep.noNA.red< - msleep.noNA [c（1,3,6,7）]
msleep.noNA.red< - msleep.noNA.red [！is。 na（msleep.noNA.red [4]），]
msleep.noNA.red< - melt（msleep.noNA.red）

pg< - ggplot（msleep.noNA .red，aes（value，name，color = variable））+
geom_point（）+
facet_grid（vore〜。，scale =free_y，space =free_y）
pg

＃尝试颠倒y轴的顺序：
pg + scale_y_reverse（）

＃不可能，因为它的一个因素，但它不被归类为：
class（msleep.noNA.red $ name）

有没有人有一些线索如何在每个子图中使动物名称按字母顺序排列？

解决方案

You ca n将字符串向量转换为因子并指定级别的顺序：

以下命令将创建一个因子。级别按字母顺序递减：

  msleep.noNA.red<  -  within（msleep.noNA.red，
 name<  -  order（name，levels = rev（sort（unique（name）））））
  

现在您可以绘制数据：

  pg < -  ggplot（msleep.noNA.red，aes（value，名称，颜色=变量））+ 
 geom_point（）+ 
 facet_grid（vore〜。，scale =free_y，space =free_y）
  

I'd like to plot a faceted ggplot2 dot plot. x-axis is continuous, y-axis is a list of animals. Two variables are plotted and faceted according to eating behavior.

The y-axis is on a free scale because each animal only appears in one eating behavior category.

library(ggplot2)

# First clean up the data set:
msleep.noNA <- msleep[!is.na(msleep$vore),]
msleep.noNA.red <-  msleep.noNA[c(1,3,6,7)]
msleep.noNA.red <- msleep.noNA.red[!is.na(msleep.noNA.red[4]),]
msleep.noNA.red <- melt(msleep.noNA.red)

pg <- ggplot(msleep.noNA.red, aes(value, name, colour = variable)) +
      geom_point() +
      facet_grid(vore ~ ., scale="free_y", space = "free_y")
pg

# Try to reverse order of the y axis:
pg + scale_y_reverse()

# Not possible because its a factor, but it's not classified as such:
class(msleep.noNA.red$name)

Does anybody have some clues as to how I can make the list of animal names alphabetical in each sub-plot?

解决方案

You can transform the string vector to a factor and specify the order of levels:

The following command will create a factor. The levels are in decreasing alphabetical order:

msleep.noNA.red <- within(msleep.noNA.red,
                         name <- ordered(name, levels = rev(sort(unique(name)))))

Now you can plot the data:

pg <- ggplot(msleep.noNA.red, aes(value, name, colour = variable)) +
  geom_point() +
  facet_grid(vore ~ ., scale="free_y", space = "free_y")

这篇关于ggplot2：在自由标度上反转每个方面的离散字符变量的顺序？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！