我碰到有這個問題的磚牆。R刪除字符向量中的重複元素,而不是重複行
我有存儲在一個字符向量一些文檔ID和日期的數據幀(日期):
Doc Dates
1 12345 c("06/01/2000","08/09/2002")
2 23456 c("07/01/2000", 09/08/2003", "07/01/2000")
3 34567 c("09/06/2004", "09/06/2004", "12/30/2006")
4 45678 c("06/01/2000","08/09/2002")
我試圖刪除的日期重複的元素,得到這樣的結果:
Doc Dates
1 12345 c("06/01/2000","08/09/2002")
2 23456 c("07/01/2000", 09/08/2003")
3 34567 c("09/06/2004", "12/30/2006")
4 45678 c("06/01/2000","08/09/2002")
我曾嘗試:
R>unique(dates$dates)
但按日期刪除重複的行:
Doc Dates
1 12345 c("06/01/2000","08/09/2002")
2 23456 c("07/01/2000", 09/08/2003")
3 34567 c("09/06/2004", "12/30/2006")
任何關於如何在日期中只刪除重複元素的幫助,而不是刪除日期重複的行嗎?
* *更新數據
# Match some text string (dates) from some text:
df1$dates <- as.character(strapply(df1[[2]], "((\\D\\d{1,2}(/|-)\\d{1,2}(/|-)\\d{2,4})| ([^/]\\d{1,2}(/|-)\\d{2,4})|((JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV){1}[\\s|-]{0,2}\\d{1,4}(\\D[\\s|-]{0,}\\d{2,4}){0,}))"))
# Drop first 2 columns from dataframe
df2<-df1[ -c(1,2)]
# List data
>df2
872 7/23/2007
873 c(" 11/4/2007", " 11/4/2007")
874 c(" 4/2/2008", " 8/2/2007")
880 11/14/2006
> class(df2)
[1] "data.frame"
> class(df2$dates)
[1] "character"
> dput(df2)
structure(list(dates = c("NULL", "NULL", " 7/23/2007", "c(\" 11/4/2007\", \" 11/4/2007\")",
"c(\" 4/2/2008\", \" 8/2/2007\")", "NULL", "NULL", "NULL", "NULL",
"NULL", " 11/14/2006")), .Names = "dates", class = "data.frame", row.names = 870:880)
所以我的問題是如何在行873擺脫了重複的日期?
請提供'dput(日期)'的輸出。它只會複製/粘貼而不是重新創建數據。 – Arun