R ddply
Similar codes
- 0 vote342 views2 answers
- 1 vote289 views1 answer
- 3 votes353 views3 answers
- 0 vote361 views1 answer
- 0 vote379 views1 answer
- 1 vote347 views1 answer
- 0 vote295 views1 answer
- 0 vote384 views1 answer
- 1 vote315 views1 answer
- -1 vote334 views1 answer