Copy values in data frame based on matching other columns

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终归单人心
终归单人心 2020-12-02 08:32

Say I have a data frame with three columns:

tt <- data.frame(a = c(1,2,2,2,3,3,3,3), b = c(1,1,0,0,1,0,0,0), c = c(100,200,5,5,300,5,5,5))



        
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