Bio::SeqIO::largefasta - method i/o on very large fasta sequence files
Do not use this module directly. Use it via the Bio::SeqIO class.
This object can transform Bio::Seq objects to and from fasta flat file databases.
This module handles very large sequence files by using the Bio::Seq::LargePrimarySeq module to store all the sequence data in a file. This can be a problem if you have limited disk space on your computer because this will effectively cause 2 copies of the sequence file to reside on disk for the life of the Bio::Seq::LargePrimarySeq object. The default location for this is specified by the File::Spec->tmpdir routine which is usually /tmp on UNIX. If a sequence file is larger than the swap space (capacity of the /tmp dir) this could cause problems for the machine. It is possible to set the directory where the temporary file is located by adding the following line to your code BEFORE calling next_seq. See Bio::Seq::LargePrimarySeq for more information.
$Bio::Seq::LargePrimarySeq::DEFAULT_TEMP_DIR = 'newdir';
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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
Title : next_seq
Usage : $seq = $stream->next_seq()
Function: returns the next sequence in the stream
Returns : A Bio::Seq::LargePrimarySeq object
Args : NONE
Title : write_seq
Usage : $stream->write_seq(@seq)
Function: writes the $seq object into the stream
Returns : 1 for success and 0 for error
Args : Bio::Seq object
To install BioPerl, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.