?tapply ---------------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352
> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of li li > Sent: Thursday, August 16, 2012 8:31 PM > To: r-help > Subject: [R] Apply a function according to factor levels. > > Dear all, > I have a question on applying a function to the data according to > factor > levels. > For example, for the data below, what is the best way to apply a > function > to > "values" according to different levels of "samples" (1,2,3,4,5)? > values ind sample > 1 0.03325 1 1 > 2 0.03305 1 1 > 3 0.03185 1 1 > 4 0.03515 1 1 > 5 0.03375 1 1 > 6 0.01180 1 2 > 7 0.01850 1 3 > 8 0.02915 1 4 > 9 0.06200 1 5 > 10 0.03230 2 1 > 11 0.03345 2 1 > 12 0.03385 2 1 > 13 0.03605 2 1 > 14 0.03225 2 1 > 15 0.01145 2 2 > 16 0.01805 2 3 > 17 0.02950 2 4 > 18 0.05995 2 5 > 19 0.03425 3 1 > 20 0.03575 3 1 > 21 0.03535 3 1 > 22 0.03380 3 1 > 23 0.03410 3 1 > 24 0.01050 3 2 > 25 0.01735 3 3 > 26 0.03140 3 4 > 27 0.06170 3 5 > 28 0.03430 4 1 > 29 0.03185 4 1 > 30 0.03165 4 1 > 31 0.03380 4 1 > 32 0.03235 4 1 > 33 0.01100 4 2 > 34 0.01825 4 3 > 35 0.03045 4 4 > 36 0.06060 4 5 > 37 0.03280 5 1 > 38 0.03350 5 1 > 39 0.03215 5 1 > 40 0.03545 5 1 > 41 0.03285 5 1 > 42 0.01085 5 2 > 43 0.01660 5 3 > 44 0.03060 5 4 > 45 0.06605 5 5 > > > Thank you. > Hannah > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
