[R] simplify a data frame

[Tord Snall]

Prof Ripley and Andy Liaw,

Thanks for you quick replies! As always, I really appreciate it! 

They are exactly what I looked for, but unique() was new to me.


Tord




At 09:25 2003-02-05 -0500, you wrote:
>Is the following what you're looking for?
>
>> try.dat
>  ObjektID BalteNummer Baltessegment
>1     S.13      S.13.1      S.13.1.2
>2     S.13      S.13.1      S.13.1.3
>3     S.13      S.13.2      S.13.2.1
>4     S.13      S.13.2      S.13.2.2
>5     S.13      S.13.2      S.13.2.3
>6     S.13      S.13.3      S.13.3.6
>7     S.13      S.13.3      S.13.3.7
>8     S.13      S.13.3      S.13.3.8
>9     S.13      S.13.3      S.13.3.9
>> unique(try.dat[,-3])
>  ObjektID BalteNummer
>1     S.13      S.13.1
>3     S.13      S.13.2
>6     S.13      S.13.3
>
>
>Andy
>
>> -----Original Message-----
>> From: Tord Snall [mailto:tord.snall at ebc.uu.se]
>> Sent: Wednesday, February 05, 2003 9:08 AM
>> To: r-help at stat.math.ethz.ch
>> Subject: [R] simplify a data frame
>> 
>> 
>> Dear all,
>> For the past three hours I have tried simplify a data frame. 
>> I would be
>> really happy if someone could help solving this, I'm sure 
>> simple, problem.
>> 
>> I want to "aggregate" the data frame:
>> 
>> ObjektID	BalteNummer	Baltessegment
>> S.13	S.13.1		S.13.1.2
>> S.13	S.13.1		S.13.1.3
>> S.13	S.13.2		S.13.2.1
>> S.13	S.13.2		S.13.2.2
>> S.13	S.13.2		S.13.2.3
>> S.13	S.13.3		S.13.3.6
>> S.13	S.13.3		S.13.3.7
>> S.13	S.13.3		S.13.3.8
>> S.13	S.13.3		S.13.3.9
>> 
>> 
>> so that the results look likte this:
>> 
>> 
>> ObjektID	BalteNummer	
>> S.13	S.13.1
>> S.13	S.13.2
>> S.13	S.13.3
>> 
>> There are in fact many ObjektID.
>> 
>> 
>> Thanks in advance!
>> 
>> 
>> Sincerely
>> Tord
>> 
>> --------------------------------------------------------------
>> ---------
>> Tord Snäll
>> Avd. f växtekologi, Evolutionsbiologiskt centrum, Uppsala universitet
>> Dept. of Plant Ecology, Evolutionary Biology Centre, Uppsala 
>> University
>> Villavägen 14			
>> SE-752 36 Uppsala, Sweden
>> Tel: 018-471 28 82 (int +46 18 471 28 82) (work)
>> Tel: 018-25 71 33 (int +46 18 25 71 33) (home)
>> Fax: 018-55 34 19 (int +46 18 55 34 19) (work)
>> E-mail: Tord.Snall at ebc.uu.se
>> Check this: http://www.vaxtbio.uu.se/resfold/snall.htm!
>> --------------------------------------------------------------
>> ----------
>> 
>> ______________________________________________
>> R-help at stat.math.ethz.ch mailing list
>> http://www.stat.math.ethz.ch/mailman/listinfo/r-help
>> 
>
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-----------------------------------------------------------------------
Tord Snäll
Avd. f växtekologi, Evolutionsbiologiskt centrum, Uppsala universitet
Dept. of Plant Ecology, Evolutionary Biology Centre, Uppsala University
Villavägen 14			
SE-752 36 Uppsala, Sweden
Tel: 018-471 28 82 (int +46 18 471 28 82) (work)
Tel: 018-25 71 33 (int +46 18 25 71 33) (home)
Fax: 018-55 34 19 (int +46 18 55 34 19) (work)
E-mail: Tord.Snall at ebc.uu.se
Check this: http://www.vaxtbio.uu.se/resfold/snall.htm!
------------------------------------------------------------------------