Subset with unique cases, based on multiple columns

Question

I\'d like to subset a dataframe to include only rows that have unique combinations of three columns. My situation is similar to the one presented in this question, but I\'d

Answer 1

I know it's an very old question, but anyway thought that the obvious solution using the unique() function should also be presented here:

unique(df[1:3])

or specifiying columns by names:

unique(df[c("v1","v2","v3)]

...and specifying rows:

unique(df[,c("v1","v2","v3)]