search for: ccttggaa

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2009 Feb 13
2
select on letter
...all 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