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Merge two columns strings new column r

Code examples

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how to combine all columns into one column in r 

unite(data, col, ..., sep = "_", remove = TRUE, na.rm = FALSE)
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r merge by two columns 

x <- data.frame(k1=c(NA,NA,3,4,5), k2=c(1,NA,NA,4,5), data=1:5)
y <- data.frame(k1=c(NA,2,NA,4,5), k2=c(NA,NA,3,4,5), data=1:5)
merge(x, y, by=c("k1","k2"))

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