key.df creates a key out of several columns of a dataframe
1 |
data |
a dataframe |
column.names |
column names that should be used for creating a unique key |
sep |
a separator for binding column contents key.df(data.frame(x=letters[ runif(10,1,10)],y=LETTERS[runif(10,1,10)],z=rnorm(10)),c("x","y"),"~") |
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