Top Answers

1. Replicate data.frame using vector length & pass each element as a new column
   3 votes
2. Identifying observations that overlap in space and time
   2 votes
3. Compute the maximum value by group and by a time "window"
   2 votes
4. How obtain the difference from two observations from the same column in R
   2 votes
5. Adding column to a dataframe in R based on matching conditions in another dataframe
   2 votes