Message-ID: <499590D7.7040407@erasmusmc.nl>
Date: 2009-02-13T15:25:11Z
From: Dimitris Rizopoulos
Subject: select on letter
In-Reply-To: <5020047.945051234538296172.JavaMail.nabble@isper.nabble.com>
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
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014