[R] select on letter

David Winsemius dwinsemius at comcast.net
Fri Feb 13 17:02:57 CET 2009

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)
> z<-data.frame(index,letters)
> index   letters
> 1     1  CCTTGGAA
> 2     2 NNTTGGAAT
> 3     3  AACCTTNN
> Thanks in advance!
> Naomi
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