1
我試圖刪除所有行,這是基於每個ID在ID有「type = B」日期或之後發生的日期。R - 在條件日期(多個條件)後刪除/刪除行
在Excel中,我會用數組搜索助手列來標記要刪除的標記。在R中有更清晰的方法嗎?
小例子:
library(data.table)
#input
colNames<-c("id","date","type")
df2 <- data.table(c("010","010","010", "010","030","210","310"),
as.Date(c("2009-08-21","2012-12-28","2014-01-01","2011-07-05","2015-04-05","2013-07-05","2012-08-01")),
c("A", "B","A","A", "A", "B", "B")
)
df2<-df2[order(df2$V1, as.Date(df2$V2, format="%y/%m/%d")),]
names(df2) <- colNames
df2
id date type
1: 010 2009-08-21 A
2: 010 2011-07-05 A
3: 010 2012-12-28 B
4: 010 2014-01-01 A
5: 030 2015-04-05 A
6: 210 2013-07-05 B
7: 310 2012-08-01 B
進入這個結果:
#output
V1 V2 V3
1: 010 2009-08-21 A
2: 010 2011-07-05 A
3: 030 2015-04-05 A
謝謝!