如何使用R根据两个数据帧中一列的匹配提取所有值?
我有一个这样的数据框,比如说n如何使用R根据两个数据帧中一列的匹配提取所有值?,r,dataframe,match,lookup,R,Dataframe,Match,Lookup,我有一个这样的数据框,比如说n id subject ------------- 1 discount less 2 product good 3 product good 4 wonderful service 5 discount less 另一个数据帧是这样的p Subject Rate ---------------- product good 20 wonderful service 30 discount less 10 i want the ou
id subject
-------------
1 discount less
2 product good
3 product good
4 wonderful service
5 discount less
另一个数据帧是这样的p
Subject Rate
----------------
product good 20
wonderful service 30
discount less 10
i want the output as :
id subject rate
--------------------
1,5 discount less
2,3 product good
4 wonderful service
如果我匹配像
p$id这样的东西怎么样:
n$subject<-as.character(n$subject)
id=sapply(unique(n$subject),function(x) paste(as.character(n[n$subject==x,]$id), collapse=", "))
subject=unique(n$subject)
df1=data.frame(id=id,subject=subject)
df2=merge(df1,p,by="subject")
df2=df2[c("id", "subject", "Rate")]
n$subject如果没有可复制的示例,很难给出准确的答案,但这是一个开始:sapply(p$subject,函数(x)paste0(n[n$subject%in%x,“id”],collapse=“,”)