> v=data.frame(c1=c("e","r","t"),v=c(1,4,2) )
> m=matrix(c("r","t","r","s","e",5,6,7,8,9),nr=5)
> colnames(m)=c("c1","c2")
> m=as.data.frame(m)
> merge(v, m, by ="c1" )
c1 v c2
1 e 1 9
2 r 4 5
3 r 4 7
4 t 2 6
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