ggplot抛出错误“找不到标签"，而“标签"显然在那里 [英] ggplot throws error `label not found`, while `label` is clearly there

问题描述

我可以使用geom_text绘制以下df的标签:

I can plot the labels of the following df using geom_text:

df <- data.frame(
  x = c(610, 426, 569, 253), 
  y = c(-226, -276, -364, -185), 
  label = c("accomplishments per week", "hours worked per week", "perceived adequacy of accomplishments", "energy level"),
  stringsAsFactors = FALSE
)

ggplot(df, aes(x, y)) + geom_text(aes(label = label))

但是，当尝试对真实数据使用相同的绘图机制时，会出现错误:

However, when trying to use the same plotting mechanism with my real data I get an error:

Error in FUN(X[[i]], ...) : object 'label' not found

为什么和如何解决?

Why is that and how can I solve it?

这是我的真实数据df1:

df1 <- structure(list(type = c("var", "var", "var", "var"),
                  id = c(1,2, 4, 7), 
                  x = c(610, 426, 569, 253), y = c(-226, -276, -364, -185), 
                  label = c("accomplishments per week", "hours worked per week",  "perceived adequacy of accomplishments", "energy level"), 
                  from = c(NA_real_,NA_real_, NA_real_, NA_real_), 
                  to = c(NA_integer_, NA_integer_,NA_integer_, NA_integer_), 
                  polarity = c(NA_character_, NA_character_, NA_character_, NA_character_), 
                  group = c(1L, 1L, 1L, 1L)), .Names = c("type","id", "x", "y", "label", "from", "to", "polarity", "group"),
             row.names = 7:10, class = c("cld", "data.frame")
             )

df

   type id   x    y                                 label from to polarity group
7   var  1 610 -226              accomplishments per week   NA NA     <NA>     1
8   var  2 426 -276                 hours worked per week   NA NA     <NA>     1
9   var  4 569 -364 perceived adequacy of accomplishments   NA NA     <NA>     1
10  var  7 253 -185                          energy level   NA NA     <NA>     1

推荐答案

您的df1属于cld和data.frame类(请参见上述str的输出中的第二行).似乎ggplot不喜欢该对象首先是cld.为了解决这个问题，使用as.data.frame强制df1仅成为data.frame类.您可以使用class(df1)进行检出，或参见下面的str(df1)输出.注意类"行.

Your df1 is of class cld and data.frame (see second line in the above output of str). It would seem that ggplot doesn't like that the object is cld first. To go around that, using as.data.frame forces df1 to become data.frame class only. You can use class(df1) to check it out, or see str(df1) output below. Notice the "Classes" line.

> str(df1)
Classes ‘cld’ and 'data.frame': 4 obs. of  9 variables:
 $ type    : chr  "var" "var" "var" "var"
 $ id      : num  1 2 4 7
 $ x       : num  610 426 569 253
 $ y       : num  -226 -276 -364 -185
 $ label   : chr  "accomplishments per week" "hours worked per week" "perceived adequacy of accomplishments" "energy level"
 $ from    : num  NA NA NA NA
 $ to      : int  NA NA NA NA
 $ polarity: chr  NA NA NA NA
 $ group   : int  1 1 1 1

如果将其强制为data.frame，则可以正常工作.

If you coerce it to data.frame, it works fine.

ggplot(as.data.frame(df1), aes(x = x, y = y, label = label)) +
  geom_text()

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