regarding your 1st question you can still use order(), i.e.,
order(Data[,5], Data[,6], Data[,8]); regarding you 2nd question look
at ?merge.
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://www.med.kuleuven.be/biostat/http://www.student.kuleuven.be/~m0390867/dimitris.htm
----- Original Message -----
From: "Stefanie von Felten, IPW&IfU" <sfelten at uwinst.unizh.ch>
To: <r-help at stat.math.ethz.ch>
Sent: Thursday, February 23, 2006 10:06 AM
Subject: [R] Questions for manipulating datasets in R e.g. sorting
andmatching
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