根据数据框的数值栏，在R中绘制“十大”风格的排行榜 [英] Plot a 'top 10' style list/ranking in R based on numerical column of dataframe

问题描述

我有一个包含字符串变量和数字变量的R数据帧，我想根据数值变量的值绘制前10个字符串。

我当然可以很简单地获得前十名的条目：

  top10_rank<  -  rank [order（rank $ numeric_var_name），] 
  

可视化这是为了简单地尝试绘制如下：

  ggplot（data = top10_rank，aes（x = top10_rank $ numeric_var_name，y = top10_rank $ string_name））+ geom_point（size = 3）
  

- 问题是，y轴上的字符串按字母顺序排序，而不是数值。

我的偏好是找到一种方法来绘制前10位字符串，而不用麻烦显示数字变量 - 基本上只是一个列表（更好的是，如果我可以枚举列表）。我试图绘制，所以看起来比简单的将文本转移到屏幕更令人愉快。

任何想法非常感谢！

解决方案

y轴刻度线可能按字母顺序排列，但是这些点按照top10_rank数据帧的顺序（从左到右）绘制。您需要做的是更改y轴的顺序。将它添加到您的ggplot调用中 + scale_y_discrete（limits = top10_rank $ String），它应该可以工作。

  ggplot（data = top10_rank，aes（x = top10_rank $ Number，
y = top10_rank $ String））+ geom_point（size = 3）+ scale_y_discrete（limits = top10_rank $ String）
  

这是一个关于R图形的很好的资源的链接： R Graphics Cookbook

I have an R dataframe that contains a string variable and a numerical variable, and I would like to plot the top 10 strings, based on the value of the numerical variable.

I can of course get the top 10 entries pretty simply:

top10_rank <- rank[order(rank$numerical_var_name),]

My first approach to trying to visualize this was to simple attempt to plot this like:

ggplot(data=top10_rank, aes(x = top10_rank$numerical_var_name, y = top10_rank$string_name)) + geom_point(size=3)

And to a first approximation this "works" - the problem is that the strings on the y axis are sorted alphabetically rather than by the numerical value.

My preference would be to find a way to plot the top 10 strings without having to bother showing the numerical variable at all - just basically as a list (even better would be if I could enumerate the list). I am attempting to plot this so it looks more pleasing than simply dumping the text to the screen.

Any ideas greatly appreciated!

解决方案

The y-axis tick marks may be sorted alphabetically, but the points are drawn in order(from left to right) of the top10_rank dataframe. What you need to do is change the order of the y-axis. Add this to your call of ggplot + scale_y_discrete(limits=top10_rank$String) and it should work.

ggplot(data=top10_rank, aes(x = top10_rank$Number, 
y = top10_rank$String)) + geom_point(size=3) + scale_y_discrete(limits=top10_rank$String)

Here is a link to a great resource on R graphics: R Graphics Cookbook

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