[R] Remove specific rows in a matrix/data.frame

[Eik Vettorazzi]

Hi Syrvn,
how about this
dtf<-read.table(textConnection("Letter Number
a 1
a 1
b 1
b 0
c 0
c 1
d 0
d 0"),header=T)
aggregate(Number~Letter,data=dtf,max)

cheers.

Am 13.10.2011 18:42, schrieb syrvn:
> Hi,
> 
> 
> imagine the following matrix/data.frame
> 
> Letter Number
> a 1
> a 1
> b 1
> b 0
> c 0
> c 1
> d 0
> d 0 
> 
> If the numbers for two identical letters are also identical then I want to
> remove either the first or the
> second row of that letter. If for a letter the numbers are 1 and 0 I want to
> remove the row with the 0.
> 
> That means if the code works I would and up with the following
> matrix/data.frame
> 
> Letter Number
> a 1
> b 1
> c 1
> d 1
> 
> 
> Many thanks,
> Syrvn
> 
> 
> --
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> 
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Eik Vettorazzi

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