Hi: Does this work?
dd <- read.table(textConnection(" C C C C T T G G A A C C G G C C G G T T A A A A T A T T C C G G C C C C T T G G A A C C G G C C "), stringsAsFactors = FALSE) # Convert the data frame to a character matrix # To do this, you need to make sure that the variables in # your data frame are character rather than factor dm <- as.matrix(dd) dm # elements should be quoted if character # Create an empty list of nrow(dm) components mm <- vector('list', nrow(dm)) # Create a two-row matrix from each row of dm for(i in seq_len(nrow(dm))) mm[[i]] <- matrix(dm[i, ], nrow = 2) > mm [[1]] [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [1,] "C" "C" "T" "G" "A" "C" "G" "C" [2,] "C" "C" "T" "G" "A" "C" "G" "C" [[2]] [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [1,] "G" "T" "A" "A" "T" "T" "C" "G" [2,] "G" "T" "A" "A" "A" "T" "C" "G" [[3]] [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [1,] "C" "C" "T" "G" "A" "C" "G" "C" [2,] "C" "C" "T" "G" "A" "C" "G" "C" HTH, Dennis On Wed, May 25, 2011 at 7:19 AM, Mohamed Lajnef <mohamed.laj...@inserm.fr> wrote: > Dear All, > Sorry for the previous mail,suppose this data.frame > D > > > V7 V8 V9 V10 V11 V12 V13 V14 V15 V16 V17 V18 V19 V20 V21 V22 > C C C C T T G G A A C C G G C C > G G T T A A A A T A T T C C G G > C C C C T T G G A A C C G G C C > > > > > > I would translate D as follow ( just for the first line) > > C C T G A C G C > C C T G A C G C > (V8 under V7) (V9 under V10) ... > > Any help would be appreciated > > Regards > M > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@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. > ______________________________________________ R-help@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.