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| # Installation | |
| # install.packages("dplyr") | |
| library(dplyr) | |
| df1 = data.frame( | |
| A=c("A1", "A2", "A3", "A4") | |
| ) | |
| df2 = data.frame( | |
| B=c("A1", "A2", "A3", "A4", "A5"), | |
| D=c("D1", "D2", "D3", "D4", "D5") | |
| ) | |
| df3 = merge(df1, df2, by.x="A", by.y="B", all.x=TRUE) | |
| colnames(df3)[2] = "C" |
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