我想创建一个条形图,其中条形图是按高度而不是按类别的字母顺序排列的。当我加载的唯一包是 ggplot2 时,这很好用。但是,当我加载更多包并运行创建、排序和绘制数据框的相同代码时,条形又恢复为按字母顺序排序。
我每次都使用 str()
检查数据框结果发现数据框的属性现在不同了,即使我每次都运行相同的代码。
下面列出了我的代码和输出。谁能解释不同的行为?为什么加载一些明显不相关的包(在我使用的任何功能似乎都没有被新加载的包掩盖的意义上不相关)会改变运行 transform()
的结果功能?
案例 1:只加载了 ggplot2
library(ggplot2)
group = c("C","F","D","B","A","E")
num = c(12,11,7,7,2,1)
data = data.frame(group,num)
data1 = transform(data, group=reorder(group,-num))
> str(data1)
'data.frame': 6 obs. of 2 variables:
$ group: Factor w/ 6 levels "C","F","B","D",..: 1 2 4 3 5 6
..- attr(*, "scores")= num [1:6(1d)] -2 -7 -12 -7 -1 -11
.. ..- attr(*, "dimnames")=List of 1
.. .. ..$ : chr "A" "B" "C" "D" ...
$ num : num 12 11 7 7 2 1
案例2:加载多个包,然后再次运行相同的代码
library(plyr)
library(xtable)
library(Hmisc)
library(gmodels)
library(reshape2)
library(vcd)
library(lattice)
group = c("C","F","D","B","A","E")
num = c(12,11,7,7,2,1)
data = data.frame(group,num)
data1 = transform(data, group=reorder(group,-num))
> str(data1)
'data.frame': 6 obs. of 2 variables:
$ group: Factor w/ 6 levels "A","B","C","D",..: 3 6 4 2 1 5
$ num : num 12 11 7 7 2 1
更新:SessionInfo()
案例 1:加载 ggplot2 后运行 sessionInfo()
> sessionInfo()
R version 2.15.0 (2012-03-30)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
locale:
[1] C/en_US.UTF-8/C/C/C/C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] ggplot2_0.9.1
loaded via a namespace (and not attached):
[1] MASS_7.3-18 RColorBrewer_1.0-5 colorspace_1.1-1 dichromat_1.2-4 digest_0.5.2 grid_2.15.0
[7] labeling_0.1 memoise_0.1 munsell_0.3 plyr_1.7.1 proto_0.3-9.2 reshape2_1.2.1
[13] scales_0.2.1 stringr_0.6 tools_2.15.0
案例 2:加载附加包后运行 sessionInfo()
> sessionInfo()
R version 2.15.0 (2012-03-30)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
locale:
[1] C/en_US.UTF-8/C/C/C/C
attached base packages:
[1] grid splines stats graphics grDevices utils datasets methods base
other attached packages:
[1] lattice_0.20-6 vcd_1.2-13 colorspace_1.1-1 MASS_7.3-18 reshape2_1.2.1 gmodels_2.15.2
[7] Hmisc_3.9-3 survival_2.36-14 xtable_1.7-0 plyr_1.7.1 ggplot2_0.9.1
loaded via a namespace (and not attached):
[1] RColorBrewer_1.0-5 cluster_1.14.2 dichromat_1.2-4 digest_0.5.2 gdata_2.8.2 gtools_2.6.2
[7] labeling_0.1 memoise_0.1 munsell_0.3 proto_0.3-9.2 scales_0.2.1 stringr_0.6
[13] tools_2.15.0
最佳答案
发生这种情况是因为:
gmodels
进口gdata
gdata
为 reorder.factor
创建一个新方法开始一个干净的 session 。然后:
methods("reorder")
[1] reorder.default* reorder.dendrogram*
现在加载
gdata
(或加载 gmodels
,具有相同的效果):library(gdata)
methods("reorder")
[1] reorder.default* reorder.dendrogram* reorder.factor
注意这里没有屏蔽,因为
reorder.factor
基地中不存在重新创建问题,但这次明确调用不同的包:
group = c("C","F","D","B","A","E")
num = c(12,11,7,7,2,1)
data = data.frame(group,num)
基本 R 版本(使用
reorder.default
):str(transform(data, group=stats:::reorder.default(group,-num)))
'data.frame': 6 obs. of 2 variables:
$ group: Factor w/ 6 levels "C","F","B","D",..: 1 2 4 3 5 6
..- attr(*, "scores")= num [1:6(1d)] -2 -7 -12 -7 -1 -11
.. ..- attr(*, "dimnames")=List of 1
.. .. ..$ : chr "A" "B" "C" "D" ...
$ num : num 12 11 7 7 2 1
gdata
版本(使用 reorder.factor
):str(transform(data, group=gdata:::reorder.factor(group,-num)))
'data.frame': 6 obs. of 2 variables:
$ group: Factor w/ 6 levels "A","B","C","D",..: 3 6 4 2 1 5
$ num : num 12 11 7 7 2 1
关于重新排序因子给出不同的结果,具体取决于加载的包,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10939516/