ggplot堆积的条形图顺序被忽略

Question

在下面的示例中，ggplots在堆叠条形图的条形时忽略了我的顺序。请注意，图例中会遵守订单。

1. 预备数据：

   plotdf <-
     structure(list(.id = structure(c(1L, 1L, 1L, 1L, 1L, 2L, 2L, 
     2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 4L, 4L, 4L, 4L, 4L, 5L, 5L, 5L, 
     5L, 5L, 6L, 6L, 6L, 6L, 6L), .Label = c("C A", "C W", "C R", 
     "I N D", "I e", "I o"), class = "factor"), grp = structure(c(3L, 
     1L, 4L, 2L, 5L, 3L, 1L, 4L, 2L, 5L, 3L, 1L, 4L, 2L, 5L, 3L, 1L, 
     4L, 2L, 5L, 3L, 1L, 4L, 2L, 5L, 3L, 1L, 4L, 2L, 5L), .Label = c("C L", 
     "F C", "C", "B", "R"), class = "factor"), v = c(0, 0.239181693913566, 
     0.165857056803677, 0.350750434828833, 0.244210814453923, 0, 0.271188523388472, 
     0.0962040631815689, 0.272432818496037, 0.360174594933923, 0.0369015572477178, 
     0.29722089026182, 0.125321399722723, 0.195349629447893, 0.345206523319846, 
     0, 0.194564544482903, 0.30578720507121, 0.139178183673556, 0.360470066772331, 
     0.0263516505214496, 0.247452946164384, 0.400260126370759, 0.0579795532895398, 
     0.267955723653867, 0, 0.369045931493036, 0.372811575779409, 0, 
     0.258142492727555)), .Names = c(".id", "grp", "v"), row.names = c(NA, 
     -30L), class = "data.frame")
   

2. 查看数据 - 有因素

   head(plotdf)
   ##   .id grp         v
   ## 1 C A   C 0.0000000
   ## 2 C A C L 0.2391817
   ## 3 C A   B 0.1658571
   ## 4 C A F C 0.3507504
   ## 5 C A   R 0.2442108
   ## 6 C W   C 0.0000000
   
   str(plotdf)
   ## 'data.frame':    30 obs. of  3 variables:
   ##  $ .id: Factor w/ 6 levels "C A","C W","C R",..: 1 1 1 1 1 2 2 2 2 2 ...
   ##  $ grp: Factor w/ 5 levels "C L","F C","C",..: 3 1 4 2 5 3 1 4 2 5 ...
   ##  $ v  : num  0 0.239 0.166 0.351 0.244 ...
   
   head(plotdf$grp)
   ## [1] C   C L B   F C R   C  
   ## Levels: C L F C C B R
   

3. 积

   ggplot(plotdf, aes(x=.id, y=v, fill=grp)) + geom_bar(stat="identity")
   

   给了我

Answer 1

因子级别的顺序指定沿轴和图例中的值的顺序。但出于任何理由，当你堆积条形图时，你还必须设置order=美学。使用

ggplot(plotdf, aes(x=.id, y=v, fill=grp, order=grp)) + geom_bar(stat="identity")