R matching more than 2 conditions and return the response value

Question

Hi I have two data set where the first one is a set of index:

ind1<-rep(c(\"E\",\"W\"), times=20)
ind2<-sample(100:150, 40)
y<-c(1:40)
index<-dat         


        

Answer 1

you can use also left_join() from dplyr package:

require(dplyr)
left_join(data, index, by = c("x1" = "ind1", "x2" = "ind2"))    

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