R 删除非NAs级别不完整的行
我已经在StackOverflow中回顾了一段时间可能的解决方案,但我必须在这方面寻求帮助 我有一个具有以下结构的数据帧:R 删除非NAs级别不完整的行,r,dataframe,filter,R,Dataframe,Filter,我已经在StackOverflow中回顾了一段时间可能的解决方案,但我必须在这方面寻求帮助 我有一个具有以下结构的数据帧: df <- data.frame(A = c("A", "A", "A", "A", "B", "B", "C", "C", "C", "C", "D"), B = c("F1", "F2", "F3", "F4", "F2", "F3", "F1", "F2", "F3", "F4", "F4")) 我希望对其
df <- data.frame(A = c("A", "A", "A", "A", "B", "B", "C", "C", "C", "C", "D"),
B = c("F1", "F2", "F3", "F4", "F2", "F3", "F1", "F2", "F3", "F4",
"F4"))
我希望对其进行过滤,以仅保留具有完整级别的行,如下所示:
df_new <- data.frame(A = c("A", "A", "A", "A", "C", "C", "C", "C"),
B = c("F1", "F2", "F3", "F4", "F1", "F2", "F3", "F4"))
请注意,Col1的过滤条件是Col2必须具有所有级别的lvls以下哪一项如何:
library(tidyverse)
df %>% group_by(A) %>%
filter(length(unique(B)) == length(levels(B)))
df %>% group_by(A) %>%
filter(n_distinct(B) == length(levels(B)))
以下哪一项如何:
library(tidyverse)
df %>% group_by(A) %>%
filter(length(unique(B)) == length(levels(B)))
df %>% group_by(A) %>%
filter(n_distinct(B) == length(levels(B)))
这是一个带有data.table的选项
这是一个带有data.table的选项
对不起,在我的问题中,我的意思是删除非NAs级别不完整的行。对不起,在我的问题中,我的意思是删除非NAs级别不完整的行。
df %>% group_by(A) %>%
filter(length(unique(B[!is.na(B)])) == length(levels(B)))
df %>% group_by(A) %>%
filter(n_distinct(B, na.rm=TRUE) == length(levels(B)))
library(data.table)
setDT(df)[, .SD[nlevels(droplevels(B))==max(nlevels(B))], A]
# A B
#1: A F1
#2: A F2
#3: A F3
#4: A F4
#5: C F1
#6: C F2
#7: C F3
#8: C F4