用dplyr进行多级排序
我有以下数据框:用dplyr进行多级排序,r,dplyr,R,Dplyr,我有以下数据框: tdf <- structure(list(GO = c("Cytokine-cytokine receptor interaction", "Cytokine-cytokine receptor interaction|Endocytosis", "I-kappaB kinase/NF-kappaB signaling", "NF-kappa B signaling pathway", "NF-kappaB import into nucleus", "T cel
tdf <- structure(list(GO = c("Cytokine-cytokine receptor interaction",
"Cytokine-cytokine receptor interaction|Endocytosis", "I-kappaB kinase/NF-kappaB signaling",
"NF-kappa B signaling pathway", "NF-kappaB import into nucleus",
"T cell chemotaxis"), PosCount = c(17, 18, 4, 5, 1, 2), shortgo = structure(c(1L,
1L, 2L, 2L, 2L, 3L), .Label = c("z", "X", "y"), class = "factor")), .Names = c("GO",
"PosCount", "shortgo"), row.names = c(NA, 6L), class = "data.frame")
然后我想做的是首先按shortgo
字母顺序排序-不区分大小写-然后对每个shortgo
组内部按PosCount
排序。因此:
GO PosCount shortgo
NF-kappa B signaling pathway 5 X
I-kappaB kinase/NF-kappaB signaling 4 X
NF-kappaB import into nucleus 1 X
T cell chemotaxis 2 y
Cytokine-cytokine receptor interaction|Endocytosis 18 z
Cytokine-cytokine receptor interaction 17 z
但为什么这不起作用:
library(dplyr)
tdf[order(tdf$shortgo),]
tdf <- tdf %>% group_by(shortgo) %>% arrange(desc(PosCount))
库(dplyr)
tdf[订单(tdf$shortgo),]
tdf%group_by(shortgo)%%>%arrange(desc(PosCount))
正确的方法是什么?您只需将它们组合到一个通话中即可。尽管您需要先将
shortgo
转换为character
类(请参见下面的说明)
因此,您需要转换为字符的原因是因为
shortgo
是一个因子,它基本上是一个integer
向量,具有levels
属性。因此,order
使用这些整数对向量进行排序。在您的情况下,整数与级别的正确顺序不对应
tdf$shortgo
## [1] z z x x x y
## Levels: z x y
as.numeric(tdf$shortgo)
## [1] 1 1 2 2 2 3
因此您可以看到,z
被编码为1,x
被编码为2,y
被编码为3,而它应该是3,2,1。因此,sort
返回“错误”结果
比照
test <- factor(sort(as.character(tdf$shortgo)))
sort(test)
## [1] x x x y z z
## Levels: x y z
test您可以使用order
baseR
:
with(tdf, tdf[order(tolower(shortgo), -PosCount),])
# GO PosCount shortgo
#4 NF-kappa B signaling pathway 5 X
#3 I-kappaB kinase/NF-kappaB signaling 4 X
#5 NF-kappaB import into nucleus 1 X
#6 T cell chemotaxis 2 y
#2 Cytokine-cytokine receptor interaction|Endocytosis 18 z
#1 Cytokine-cytokine receptor interaction 17 z
请注意,tolower
除了将因子
转换为字符
sort(tdf$shortgo)
# 1] z z x x x y
# Levels: z x y
test <- factor(sort(as.character(tdf$shortgo)))
sort(test)
## [1] x x x y z z
## Levels: x y z
with(tdf, tdf[order(tolower(shortgo), -PosCount),])
# GO PosCount shortgo
#4 NF-kappa B signaling pathway 5 X
#3 I-kappaB kinase/NF-kappaB signaling 4 X
#5 NF-kappaB import into nucleus 1 X
#6 T cell chemotaxis 2 y
#2 Cytokine-cytokine receptor interaction|Endocytosis 18 z
#1 Cytokine-cytokine receptor interaction 17 z