select on letter
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 Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014