R 仅返回基于另一个变量的变量的第一个实例
我有一个ID列表(有些是重复的),还有一个R 仅返回基于另一个变量的变量的第一个实例,r,R,我有一个ID列表(有些是重复的),还有一个KEEP变量。如果KEEP列中有一个实例,我想创建一个1或0的列,即使它不是那个特定的列 id <- c(101,101,101,102,102,102,103,103,103,104,104,106,107,108) keep <- c("Y",0,0,"Y",0 ,0 ,"Y" ,0 ,0 ,0 ,0 ,0 ,0 ,0) df <- data.frame(id, keep) 库(dplyr) df%>%group_by(id)%>
KEEP
变量。如果KEEP列中有一个实例,我想创建一个1或0的列,即使它不是那个特定的列
id <- c(101,101,101,102,102,102,103,103,103,104,104,106,107,108)
keep <- c("Y",0,0,"Y",0 ,0 ,"Y" ,0 ,0 ,0 ,0 ,0 ,0 ,0)
df <- data.frame(id, keep)
库(dplyr)
df%>%group_by(id)%>%mutate(countkeep=ifelse(any(keep==“Y”),1,0))
我要继续计数
101Y1
2 101 0 1
3 101 0 1
4 102 Y 1
5 102 0 1
6 102 0 1
7 103 Y 1
8 103 0 1
9 103 0 1
10 104 0 0
11 104 0 0
12 106 0 0
13 107 0 0
14 108 0 0
我们可以使用数据表
library(data.table)
setDT(df)[, countkeep := +(any(keep=="Y")), id]
df
# id keep countkeep
# 1: 101 Y 1
# 2: 101 0 1
# 3: 101 0 1
# 4: 102 Y 1
# 5: 102 0 1
# 6: 102 0 1
# 7: 103 Y 1
# 8: 103 0 1
# 9: 103 0 1
#10: 104 0 0
#11: 104 0 0
#12: 106 0 0
#13: 107 0 0
#14: 108 0 0
transform(df, countkeep = +(id %in% names(na.omit(NA^!table(df)[,"Y"]))))
或使用base R
df$countkeep <- with(df, as.integer(ave(keep=="Y", id, FUN = any)))
如果你想要一个基本答案,这个答案也应该有效
df$countkeep <- ifelse(df$id %in% df$id[which(df$keep == "Y")], 1, 0)
> df
id keep countkeep
1 101 Y 1
2 101 0 1
3 101 0 1
4 102 Y 1
5 102 0 1
6 102 0 1
7 103 Y 1
8 103 0 1
9 103 0 1
10 104 0 0
11 104 0 0
12 106 0 0
13 107 0 0
14 108 0 0
df$countkeep df
我要继续计数
101Y1
2 101 0 1
3 101 0 1
4 102 Y 1
5 102 0 1
6 102 0 1
7 103 Y 1
8 103 0 1
9 103 0 1
10 104 0 0
11 104 0 0
12 106 0 0
13 107 0 0
14 108 0 0
也许有一种更优雅的方法可以做到这一点,但这是可行的:
df$countkeep <- apply(df,1,function(x){
if(nrow(subset(df,id==x[1] & keep=="Y"))==1)
1
else
0
})
df$countkeep这正是我所需要的,它在dplyr中非常有效,我也很喜欢。干得好。谢谢当用户投反对票时,也请分享原因。这会很有帮助
df$countkeep <- ifelse(df$id %in% df$id[which(df$keep == "Y")], 1, 0)
> df
id keep countkeep
1 101 Y 1
2 101 0 1
3 101 0 1
4 102 Y 1
5 102 0 1
6 102 0 1
7 103 Y 1
8 103 0 1
9 103 0 1
10 104 0 0
11 104 0 0
12 106 0 0
13 107 0 0
14 108 0 0
df$countkeep <- apply(df,1,function(x){
if(nrow(subset(df,id==x[1] & keep=="Y"))==1)
1
else
0
})