[英]Removing repeats and blanks from R data frame
我在這里為數據結構提前道歉,但我堅持下去......
我有一個包含大量重復和空白的數據框,如下所示:
df <- data.frame(
country=c("Afghanistan", "Afghanistan", "Algeria", "Australia", "Australia", "Australia"),
survey.1=c("Influenza","", "","","Influenza","Influenza"),
survey.2=c("","Hepatitis C","","","",""),
survey.3=c("West Nile Virus", "", "", "", "", "West Nile Virus"))
country survey.1 survey.2 survey.3
1 Afghanistan Influenza West Nile Virus
2 Afghanistan Hepatitis C
3 Algeria
4 Australia
5 Australia Influenza
6 Australia Influenza West Nile Virus
我需要刪除重復和空白但保持相同的數據結構(我不知道你會稱之為什么......'集中'而不是'聚合'可能?)。 所以我最終得到的是:
country survey.1 survey.2 survey.3
1 Afghanistan Influenza Hepatitis C West Nile Virus
2 Australia Influenza West Nile Virus
有人可以幫忙嗎?
使用plyr
:
ddply(df,.(country),
function(x)
sapply(x,function(y){
xx= unique(y[nchar(y)>0])
ifelse(length(xx)>0,xx,unique(y))
}
)
)
country survey.1 survey.2 survey.3
1 Afghanistan Influenza Hepatitis C West Nile Virus
2 Algeria
3 Australia Influenza West Nile Virus
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