I have a data File, the format of which is given below. It has two fields,
namely  sequence and probeset name.
    sequence                                       Probe.Set.Name
GCTACTTTACTCCAGAATTTTGTTA      1367452_at
TTAGAAAGCCGCAATTTGGTCCCGC    1367452_at
GCCACATCCTGACTACTGCAGTATA     1367452_at
............
AAAAAAAAGGGGGGGTCCCCCCCC     1234567_at


Now, I want to convert that into FASTA format as follows (please note  dot
extensions in each descriptor).

>1367452_at.1
GCTACTTTACTCCAGAATTTTGTTA
>1367452_at.2
TTAGAAAGCCGCAATTTGGTCCCGC
>1367452_at.3
GCCACATCCTGACTACTGCAGTATA
.......
....
>1234567_at.1
AAAAAAAAAAAAACCCCCCCCCCCC


I am getting the required output by using writeFASTA(..) function but it is
too slow because I am using loop and in every loop it access the file to
write into.

Is there anyway through which I can write this fasta information into some
variable and once I am done I write back that  variable into the required
file.

Thanks and regards
Fahim


-- 
Mohammad Fahim
Bioinforformatics Lab
University of Louisville
Louisville, KY, USA
Ph:  +1-502-409-1167

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