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I have two dataframes C and C1. Each has three columns viz. state, psu and weight. The dataframes are of unequal size i.e. C1 could be 2/25/50 rows and C has 42000 rows. C1 is the master table i.e. C1$state, C1$psu and C1$weight are never the same. ThisA. P., Urban, 0 is not so for C. For example C state, psu,weight A. P., Urban, 0 Mah., Rural, 0 W.B., Rural,0 Ass., Rural,0 M. P., Urban,0 A. P., Urban, 0 ... C1 state, psu, weight A. P., Urban, 1.3 A. P., Rural, 1.2 M. P., Urban, 0.8 ...... For every row of C, I want to check if C$state==C1$state...