Hi

I have a DNAStringset containing some sequences of length 25. i want to make an .fq file of it but first i need to add a "specific" header (which stored in a vector) for each read. the data is like this:

A DNAStringSet instance of length 2
 width seq                             names               
 [1]    25 AGCTTTTCATTCTGACTGCAACGGG    coli
 [2]    25 ATTTCCTTACTCAACCCCGAAACGC    coli

And the result that i want is like:

@coli:1500
AGCTTTTCATTCTGACTGCAACGGG
+
XXXXXXXXXXXXXXXXXXXXXXXX
@coli:1700
ATTTCCTTACTCAACCCCGAAACGC
+
XXXXXXXXXXXXXXXXXXXXXXXX

I can simply make each line and write it to file using cat() function but this is really slow for large datasets. so i found writeXStringSet(data,format=".fq") to use. but i can't find how to prepare my object for using this function.

My question is:

How to prepare my file for this function? or is there any other easy and quick way of doing this?

Thanks all