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[英]Create another dataframe based on an existing dataframe based on a column value in R
[英]Create a new column on a dataframe based on value match with another dataframe
我有一個名為“ INDEX”的數據框和一個名為“ TABLE”的數據框。
我希望能夠在“表”中添加一個名為“ ID”的新列,其中將包括“ INDEX”數據幀的相對“ ID”。
例如,“ Mark1”與ID = 1匹配,以此類推。最終結果將是:
Mark2 ID
1 Mark4 4
2 Mark4 4
3 Mark3 3
4 Mark1 1
5 Mark2 2
ID<-c("1","2","3","4")
Mark=c("Mark1","Mark2","Mark3","Mark4")
INDEX=data.frame(ID,Mark)
Mark2=c("Mark4","Mark4","Mark3","Mark1","Mark2")
TABLE=data.frame(Mark2)
for(i in 1:nrow(TABLE)){
if(INDEX[,1]==TABLE[i,1]){
TABLE$ID<-INDEX$ID
}
}
使用match
TABLE$ID=INDEX$ID[match(TABLE$Mark2,INDEX$Mark)]
TABLE
Mark2 ID
1 Mark4 4
2 Mark4 4
3 Mark3 3
4 Mark1 1
5 Mark2 2
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