[R] select on letter

[Dimitris Rizopoulos]

one way is:

index <- c(1, 2, 3)
let <- c("CCTTGGAA", "NNTTGGAAT", "AACCTTNN")
z <- data.frame(index, let)

index[-grep("N", let)]
# or
z[-grep("N", let), ]


I hope it helps.

Best,
Dimitris


naomi.duijvesteijn at ipg.nl wrote:
> Hi,
> 
> I was wondering if anybody can help me. In the small data set below I would like to select the index which doesn't contain the letter 'N' in the variable 'letters'. How can I discard these rows when the letter has a different position everytime (but the same letter for the whole column)?
> 
> index<-c(1,2,3)
> letters<-c("CCTTGGAA", "NNTTGGAAT", "AACCTTNN")
> z<-data.frame(index,letters)
> 
> 
>  index   letters
> 1     1  CCTTGGAA
> 2     2 NNTTGGAAT
> 3     3  AACCTTNN
> 
> 
> Thanks in advance!
> Naomi
> 
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus Medical Center

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