Top Answers

1. How to join (merge) data frames (inner, outer, left, right)
   9 votes
2. Match substring of two vectors and create a new vector combining them
   8 votes
3. Data frame to nested list
   6 votes
4. Filtering observations based on specific date condition using data.table
   6 votes
5. Find position of first value greater than 0 in column A and return value in that position in column B
   5 votes