Bio::ASN1::Sequence::Indexer - Indexes NCBI Sequence files.
use Bio::ASN1::Sequence::Indexer; # creating & using the index is just a few lines my $inx = Bio::ASN1::Sequence::Indexer->new( -filename => 'seq.idx', -write_flag => 'WRITE'); # needed for make_index call, but if opening # existing index file, don't set write flag! $inx->make_index('seq1.asn', 'seq2.asn'); my $seq = $inx->fetch('AF093062'); # Bio::Seq obj for Sequence (doesn't work yet) # alternatively, if one prefers just a data structure instead of objects $seq = $inx->fetch_hash('AF093062'); # a hash produced by Bio::ASN1::Sequence # that contains all data in the Sequence record
Bio::ASN1::Sequence, Bioperl and all dependencies therein.
Same as Bio::ASN1::EntrezGene
Bio::ASN1::Sequence::Indexer is a Perl Indexer for NCBI Sequence genome databases. It processes an ASN.1-formatted Sequence record and stores the file position for each record in a way compliant with Bioperl standard (in fact its a subclass of Bioperl's index objects).
Note that this module does not parse record, because it needs to run fast and grab only the gene ids. For parsing record, use Bio::ASN1::Sequence.
As with Bio::ASN1::Sequence, this module is best thought of as beta version - it works, but is not fully tested.
Please check out perldoc for Bio::ASN1::EntrezGene for more info.
Dr. Mingyi Liu <mingyi.liu@gpc-biotech.com>
The Bio::ASN1::EntrezGene module and its related modules and scripts are copyright (c) 2005 Mingyi Liu, GPC Biotech AG and Altana Research Institute. All rights reserved. I created these modules when working on a collaboration project between these two companies. Therefore a special thanks for the two companies to allow the release of the code into public domain.
You may use and distribute them under the terms of the Perl itself or GPL (http://www.gnu.org/copyleft/gpl.html).
Liu, M and Grigoriev, A (2005) "Fast Parsers for Entrez Gene" Bioinformatics. In press
Any OS that Perl & Bioperl run on.
Parameters: $geneid - id for the Sequence record to be retrieved Example: my $hash = $indexer->fetch(10); # get Sequence #10 Function: fetch the data for the given Sequence id. Returns: A Bio::Seq object produced by Bio::SeqIO::sequence Notes: Bio::SeqIO::sequence does not exist and probably won't exist for a while! So call fetch_hash instead
Parameters: $seqid - id for the Sequence record to be retrieved Example: my $hash = $indexer->fetch_hash('AF093062'); Function: fetch a hash produced by Bio::ASN1::Sequence for given id Returns: A data structure containing all data items from the Sequence record. Notes: Alternative to fetch()
Title : _file_handle Usage : $fh = $index->_file_handle( INT ) Function: Returns an open filehandle for the file index INT. On opening a new filehandle it caches it in the @{$index->_filehandle} array. If the requested filehandle is already open, it simply returns it from the array. Example : $fist_file_indexed = $index->_file_handle( 0 ); Returns : ref to a filehandle Args : INT Notes : This function is copied from Bio::Index::Abstract. Once that module changes file handle code like I do below to fit perl 5.005_03, this sub would be removed from this module
To install Bio::ASN1::EntrezGene, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Bio::ASN1::EntrezGene
CPAN shell
perl -MCPAN -e shell install Bio::ASN1::EntrezGene
For more information on module installation, please visit the detailed CPAN module installation guide.