使用geom_text&facet_wrap：单位中的错误(x,default.units)：’x’和’units’的长度必须大于0

2023年11月13日 218次阅读

我遇到了这个奇怪的错误..

一些测试数据：

library(ggplot2)
library(dplyr)

test <- structure(list(group = structure(c(1L, 2L, 1L, 1L, 1L, 1L, 1L, 
    1L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 1L, 
    2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 
    2L, 3L, 3L, 3L, 3L, 3L), .Label = c("G", "N", "P"), class = "factor"), 
        var = structure(c(1L, 1L, 2L, 3L, 4L, 4L, 4L, 4L, 2L, 2L, 
        2L, 3L, 2L, 2L, 2L, 5L, 5L, 5L, 4L, 5L, 5L, 5L, 5L, 1L, 1L, 
        2L, 1L, 1L, 1L, 3L, 3L, 3L, 5L, 3L, 3L, 3L, 4L, 4L, 4L, 1L, 
        1L, 2L, 2L, 2L, 3L), .Label = c("a", "b", "c", "d", "e"), class = "factor"), 
        group2 = structure(c(3L, 1L, 3L, 3L, 1L, 2L, 3L, 4L, 1L, 
        2L, 3L, 4L, 1L, 2L, 4L, 1L, 2L, 3L, 4L, 1L, 2L, 3L, 4L, 2L, 
        3L, 4L, 1L, 2L, 4L, 1L, 2L, 3L, 4L, 1L, 2L, 4L, 1L, 2L, 3L, 
        4L, 1L, 1L, 2L, 3L, 4L), .Label = c("O", "P", "Q", "R"), class = "factor"), 
        cor = c(0.270075198428616, 0.262097140096646, -0.331312784846655, 
        -0.343984945812309, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
        NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
        NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
        NA)), row.names = c(NA, -45L), .Names = c("group", "var", 
    "group2", "cor"), class = "data.frame")

我想制作这个情节：

test %>% 
  ggplot(., aes(x=group2, y=cor)) +
  geom_bar(stat="identity", position="dodge", aes(fill=var, group=var)) +
  geom_text(aes(label = round(cor,2),
                vjust = ifelse(cor >= 0, 0, 1),
                group=var),
            position = position_dodge(width=1)) +
  theme_bw(base_size=18) +
  facet_wrap(~group, scales="free_x")

..导致：单位错误(x,default.units)：’x’和’units’必须有长度> 0

但是,没有geom_text它可以工作：
《使用geom_text&facet_wrap：单位中的错误(x,default.units)：’x’和’units’的长度必须大于0》

而且只使用1:40行：

test %>% slice(1:40) %>%
  ggplot(., aes(x=group2, y=cor)) +
  geom_bar(stat="identity", position="dodge", aes(fill=var, group=var)) +
  geom_text(aes(label = round(cor,2),
                vjust = ifelse(cor >= 0, 0, 1),
                group=var),
            position = position_dodge(width=1)) +
  theme_bw(base_size=18) +
  facet_wrap(~group, scales="free_x")

《使用geom_text&facet_wrap：单位中的错误(x,default.units)：’x’和’units’的长度必须大于0》

因此,第40行只有两个级别,而第41行则是第三级.但是怎么会导致这个错误呢？或者还有其他我看不到的东西？

最佳答案 如果擦除facet_wrap或者如果不是所有P-group都是NA,则错误也会消失(例如,在0.2中更改cor的最后一个条目).显然,如果一个方面是空的(只包含NA),geom_text就无法处理.

如果你真的想要包含空面,这是一个解决方法：
1.用0替换空面中至少1个(或全部？)NA.条形长度为0,所以没问题
2.现在,图表中的标签为零.通过使用alpha = ifelse(cor == 0,0,1),您将使该标签完全透明.

码：

library(ggplot2)
library(dplyr)
test <- structure(list(group = structure(c(1L, 2L, 1L, 1L, 1L, 1L, 1L, 
                                           1L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 1L, 
                                           2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 
                                           2L, 3L, 3L, 3L, 3L, 3L), .Label = c("G", "N", "P"), class = "factor"), 
                       var = structure(c(1L, 1L, 2L, 3L, 4L, 4L, 4L, 4L, 2L, 2L, 
                                         2L, 3L, 2L, 2L, 2L, 5L, 5L, 5L, 4L, 5L, 5L, 5L, 5L, 1L, 1L, 
                                         2L, 1L, 1L, 1L, 3L, 3L, 3L, 5L, 3L, 3L, 3L, 4L, 4L, 4L, 1L, 
                                         1L, 2L, 2L, 2L, 3L), .Label = c("a", "b", "c", "d", "e"), class = "factor"), 
                       group2 = structure(c(3L, 1L, 3L, 3L, 1L, 2L, 3L, 4L, 1L, 
                                            2L, 3L, 4L, 1L, 2L, 4L, 1L, 2L, 3L, 4L, 1L, 2L, 3L, 4L, 2L, 
                                            3L, 4L, 1L, 2L, 4L, 1L, 2L, 3L, 4L, 1L, 2L, 4L, 1L, 2L, 3L, 
                                            4L, 1L, 1L, 2L, 3L, 4L), .Label = c("O", "P", "Q", "R"), class = "factor"), 
                       cor = c(0.270075198428616, 0.262097140096646, -0.331312784846655, 
                               -0.343984945812309, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
                               NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
                               NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
                               0)), row.names = c(NA, -45L), .Names = c("group", "var", 
                                                                         "group2", "cor"), class = "data.frame")


test %>% 
  ggplot(., aes(x=group2, y=cor)) +
  geom_bar(stat="identity", position="dodge", aes(fill=var, group=var)) +
  geom_text(aes(label = round(cor,2),
                vjust = ifelse(cor >= 0, 0, 1),
                group=var, alpha=ifelse(cor == 0, 0, 1)),
            position = position_dodge(width=1)) +
  theme_bw(base_size=18) +
  facet_wrap(~group, scales="free_x")

《使用geom_text&facet_wrap：单位中的错误(x,default.units)：’x’和’units’的长度必须大于0》

如果要删除geom_text的图例,只需添加show_guide = FALSE即可.

编辑：如果透明度不正常,@ beetroot提出了这个不错的选择：用size = ifelse替换alpha = ifelse(cor == 0,0,1)(cor == 0,NA,3))

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