Re: [R] Questions for manipulating datasets in R e.g. sorting andmatching

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>
Date: Thu 23 Feb 2006 - 20:17:38 EST

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


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

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ETH Zürich
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und:

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Received on Thu Feb 23 20:25:07 2006

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