- AUTHOR - Ewan Birney
Bio::Seq::LargeSeq - SeqI compliant object that stores sequence as files in /tmp
# normal primary seq usage
This object stores a sequence as a series of files in a temporary directory. The aim is to allow someone the ability to store very large sequences (eg, > 100MBases) in a file system without running out of memory (eg, on a 64 MB real memory machine!).
Of course, to actually make use of this functionality, the programs which use this object must not call $primary_seq->seq otherwise the entire sequence will come out into memory and probably paste your machine. However, calls $primary_seq->subseq(10,100) will cause only 90 characters to be brought into real memory.
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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
Title : trunc Usage : $subseq = $myseq->trunc(10,100); Function: Provides a truncation of a sequence, Example : Returns : a fresh Bio::SeqI object Args :
Title : add_sequence_as_string Usage : $seq->add_sequence_as_string("CATGAT"); Function: Appends additional residues to an existing LargePrimarySeq object. This allows one to build up a large sequence without storing entire object in memory. Returns : Current length of sequence Args : string to append