Bio::Seq::LargeSeqI - Interface class for sequences that cache their residues in
a temporary file
The interface class defines a group of sequence classes that do not keep their
sequence information in memory but store it in a file. This makes it possible
to work with very large files even with limited RAM.
The most important consequence of file caching for sequences is that you do not
want to inspect the sequence unless absolutely necessary. These sequences
typically override the length()
method not to check the sequence.
method is not resetable, if you want to add to the end of the
sequence you have to use add_sequence_as_string()
, for any other
sequence changes you'll have to create a new object.
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The rest of the documentation details each of the object methods. Internal
methods are usually preceded with a _
Title : add_sequence_as_string
Usage : $seq->add_sequence_as_string("CATGAT");
Function: Appends additional residues to an existing 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