Message-ID: <62415F70-7EBB-4A6B-B629-FEC64FDD720D@comcast.net>
Date: 2009-02-13T16:02:57Z
From: David Winsemius
Subject: select on letter
In-Reply-To: <5020047.945051234538296172.JavaMail.nabble@isper.nabble.com>
You really should not assign a new value to "letters" since it is a
very useful constant vector that allows working with lowercase
letters. Notice that Domitris did not copy your code exactly.
Next time you start R type letters at the R prompt. You cannot do so
now, since you overwrote that constant with your own construction.
LETTERS would still work.
--
David Winsemius
On Feb 13, 2009, at 10:18 AM, 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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