ggplot2代码运行并更新绘图，但实际上没有数据显示 [英] ggplot2 code runs and updates plot but no data actually shows up

问题描述

我试图在R中使用 ggplot2 来生成一个图。虽然我能够使用 plot（），当我运行下面的ggplot代码时，它显示了正确的坐标轴，但没有数据或缩放比例。

数据看起来像这样：

  data < -  data.frame（area = c（alpha，alpha，bravo，bravo ，charlie，charlie），
 year = c（2001,2002,2002,2002,2002,2002），
 rate = c（.94，.90，.83，。 87，.87，.95））
  

其中area是一个字符变量，year / rate是数值。

如果我运行

  plot（data $ year，data $费率）
  

我在图表窗口中看到我期望看到的图表。我想要做的是在ggplot中重新创建一个线形图。这里是我的尝试：

  gg < -  ggplot（data = data，aes（x =year，y = （）），group =area））
 gg + geom_point（）
 gg + geom_line（）
 gg 
 
＃也尝试使用子集来移除组问题，认为这可能有帮助，但事实并非如此。也删除了这一行
 temp<  -  data [data $ area ==alpha，] 
 gg<  -  ggplot（data = temp，aes（x =year，y = rate））
 gg + geom_point（）
 gg 
 
＃也尝试过这种方法，它可以在仍然为空的图的中间放置一个点
 ggplot （data = test）+ 
 geom_point（mapping = aes（x =Year，y =考勤率，group =Area））
  

在这两种情况下，我都得到了相同的结果：代码运行良好（无错误），并且绘图窗口刷新到最近我最近处理的任何一个，但是适当的X和Y标签（年/费率）它并不真正把数据放在那里。也没有比例尺，所以它显然不会读取这些信息。

我在这里做错了什么？我一直在使用下面的指南和参考手册，但我（至少想想我）正在重新创建它们，但显然我不是。

如果由于某些原因您必须使用引号，请使用 aes_string 相反：

  ggplot（data，aes_string（year，rate，group =area））+ 
 geom_point（）+ 
 geom_line（）
  

I'm trying to produce a graph using ggplot2 in R. While I am able to generate the graph I want using plot() and when I run the ggplot code below it shows up with the proper axes, but there's no data or scale.

Data looks something like this:

data <- data.frame(area=c("alpha", "alpha", "bravo", "bravo", "charlie", "charlie"),
                   year=c(2001, 2002, 2001, 2002, 2001, 2002),
                   rate=c(.94, .90, .83, .87, .87, .95))

where area is a character variable and year/rate are but numerical.

If I run

plot(data$year, data$rate)

I get in the plot window the graph that I expect to see. What I'm trying to do is recreate this in ggplot as a line graph. Here's what I tried:

gg <- ggplot(data=data, aes(x="year", y="rate", group="area"))
gg + geom_point()
gg + geom_line()
gg

# also tried subsetting to remove the group issue, thinking that might help but it didn't. also removed line from this too
temp <- data[data$area=="alpha",]
gg <- ggplot(data=temp, aes(x="year", y="rate"))
gg + geom_point()
gg

# also tried this which manages to put a dot in the middle of the still empty plot
ggplot(data=test) +
     geom_point(mapping=aes(x="Year", y="Attendance Rate", group="Area"))

In both instances, I get the same result: the code runs fine (error free) and the plot window refreshes to whichever one I treid most recently, but while it has proper X and Y labels (year/rate) it doesn't actually put the data on there. There also is no scale so it's not reading that information in either, apparently.

What am I doing wrong here? I've been using the guides and reference sheets below but I (at least would like to think I) am recreating them properly but clearly I'm not.

https://www.rstudio.com/wp-content/uploads/2016/11/ggplot2-cheatsheet-2.1.pdf

http://r-statistics.co/ggplot2-cheatsheet.html

http://www.sthda.com/english/wiki/ggplot2-line-plot-quick-start-guide-r-software-and-data-visualization

http://tutorials.iq.harvard.edu/R/Rgraphics/Rgraphics.html

解决方案

Don't use quotes.
With: aes("year", "rate") you were plotting words "year" and "rate".
With aes(year, rate) you plot variable year and rate in data data.

ggplot(data, aes(year, rate, group = area)) + 
    geom_point() + 
    geom_line()

If for some reason you have to use quotes then use aes_string instead:

ggplot(data, aes_string("year", "rate", group = "area")) + 
    geom_point() + 
    geom_line()

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