Questions for manipulating datasets in R e.g. sorting and matching
Hello everyone, I want to sort a dataset in R, using multiple columns as sorting criteria. I know I can sort a dataset "Data" with 14 columns using one column (the fifth), by typing: DataSort<-Data[order(Data[,5]),1:14] But how can the dataset be sorted by column 5, then by 6, then by 8? Another question is, how two datasets can be matched by a column present in both of them? Steffi
--------------------------------- Stefanie von Felten Doktorandin ETH Z??rich Institut f??r Pflanzenwissenschaften ETH Zentrum, LFW A 2 Telefon: 044 632 85 97 Telefax: 044 632 11 53 e-mail: stefanie.vonfelten at ipw.agrl.ethz.ch http://www.ipw.agrl.ethz.ch/~svfelten/ und: Universit??t Z??rich Institut f??r Umweltwissenschaften Winterthurerstrasse 190 8057 Z??rich Telefon: 044 635 61 23 Telefax: 044 635 57 11 e-mail: sfelten at uwinst.unizh.ch http://www.unizh.ch/uwinst/homepages/steffi.html