Suppose I got a data table with multiple columns. I want to update this data table in such a way that only unique observations by a pre specified column appear. For example,
data.table(c(1,2,2,3,4),c(2,3,5,4,3))
should be transformed to
data.table(c(1,2,3,4),c(2,3,4,3))
Here the pre-specified column is the first one I tried to use unique() function, but it returns vector with unique values and does nothing with the data table itself
