如何用R ggplot2中的多个变量标记轴 [英] How to label an axis with several variables in R ggplot2

问题描述

我有一个数据框如下：

 名称，导师，测试，分数，百分比，school.year 
 Mark，Eric，Maths，100,100,2 
 Mark，Eric，英语，91,91,2 
 Sue，Richard，Maths，88,100,5 
 Sue，Richard，英语，71， 80.7,5 
  

我想在y轴上绘制百分比，在x轴上绘制条形图为每个测试。我的代码做我想要的情节，但x轴标签只是名称。我想在x轴上添加其他变量（仅用于标签）。所以比如标有2个小节; 1代表数学，1代表英语，他的xaxis标签也有'mark''\\''Eric'的标注，所以我们可以看到谁指导了他。如果可能的话，我想添加几个额外的标签，如学年。我的代码到目前为止如下;

 结果<  -  read.csv（'results.csv'）
p <  -  ggplot（results，aes（y = Percent，x = Name，color = Test，fill = Test））+ 
 geom_bar（stat ='identity'，position ='dodge'）+ 
 ggtitle（'Test Results'）+ 
 ylab（'Percent'）
  

例如：

  + scale_x_discrete（labels = results $ Score）
 
 
 
 
 $ b 
或手动更改它们（尽管订单有问题）; 
 
  p> scale_x_discrete（labels = c（'Mark \\\
 Eric'，'Sue \ Richard'，等等））
 
 
有没有办法添加其他变量到X标签，最好是换行符？非常感谢 
 
解决方案
我建议在数据框中创建另一列，其中包含标签，然后将其用作 x ：
  results $ label<  -  paste（results $ Name ，结果$ Tutor，sep ='\\\
'）
 
 ggplot（results，aes（y = Percent，x = label，color = Test，fill = Test））+ 
 geom_bar （'stat'='identity'，position ='dodge'）+ 
 ggtitle（'Test Results'）+ 
 ylab（'Percent'）
  
  
 
I have a dataframe as follows:
 Name,Tutor,Test,Score,Percent,school.year
 Mark,Eric,Maths,100,100,2
 Mark,Eric,English,91,91,2
 Sue,Richard,Maths,88,100,5
 Sue,Richard,English,71,80.7,5
I would like to plot percent on the y axis and name on the x axis with bars for each test. My code does the plot how I would like but the x-axis label is just the name. I would like to add other variables (just to the label) in the x-axis. So for example mark with have 2 bars; 1 for maths and 1 for english, his xaxis label with also say 'mark' '\n' 'Eric' so we can see who tutored him. If possible I would like to add several additional labels such as school year. My code so far is as follows;
 results <- read.csv('results.csv')
 p <- ggplot(results, aes(y=Percent, x=Name, colour=Test, fill=Test)) + 
 geom_bar(stat='identity', position='dodge') + 
 ggtitle('Test Results') + 
 ylab('Percent')
I can plot a single variable as the x-axis label e.g:
 +scale_x_discrete(labels = results$Score)
or change them manually (although there are problems with the order);

scale_x_discrete(labels = c('Mark \n Eric','Sue \n Richard', etc))

Is there a way to add other variables to the x-labels, ideally with line breaks? Many thanks
解决方案
I'd suggest to create another column in your data frame, which will contain labels, and then use it as x:
results$label <- paste(results$Name,results$Tutor,sep='\n')

ggplot(results, aes(y=Percent, x=label, colour=Test, fill=Test)) +
  geom_bar(stat='identity', position='dodge') +
  ggtitle('Test Results') +
  ylab('Percent')


                        
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