| Bio::ASN1::EntrezGene::Indexer(3pm) | User Contributed Perl Documentation | Bio::ASN1::EntrezGene::Indexer(3pm) |
Bio::ASN1::EntrezGene::Indexer - Indexes NCBI Sequence files.
version 1.73
use Bio::ASN1::EntrezGene::Indexer;
# creating & using the index is just a few lines
my $inx = Bio::ASN1::EntrezGene::Indexer->new(
-filename => 'entrezgene.idx',
-write_flag => 'WRITE'); # needed for make_index call, but if opening
# existing index file, don't set write flag!
$inx->make_index('Homo_sapiens', 'Mus_musculus', 'Rattus_norvegicus');
my $seq = $inx->fetch(10); # Bio::Seq obj for Entrez Gene #10
# alternatively, if one prefers just a data structure instead of objects
$seq = $inx->fetch_hash(10); # a hash produced by Bio::ASN1::EntrezGene
# that contains all data in the Entrez Gene record
# note that in case you wonder, you can get the files 'Homo_sapiens'
# from NCBI Entrez Gene ftp download, DATA/ASN/Mammalia directory
Bio::ASN1::EntrezGene::Indexer is a Perl Indexer for NCBI Entrez Gene genome databases. It processes an ASN.1-formatted Entrez Gene 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::EntrezGene, or better yet, use Bio::SeqIO, format 'entrezgene'.
It takes this module (version 1.07) 21 seconds to index the human genome Entrez Gene file (Apr. 5/2005 download) on one 2.4 GHz Intel Xeon processor.
Parameters: $geneid - id for the Entrez Gene record to be retrieved Example: my $hash = $indexer->fetch(10); # get Entrez Gene #10 Function: fetch the data for the given Entrez Gene id. Returns: A Bio::Seq object produced by Bio::SeqIO::entrezgene Notes: One needs to have Bio::SeqIO::entrezgene installed before calling this function!
Parameters: $geneid - id for the Entrez Gene record to be retrieved Example: my $hash = $indexer->fetch_hash(10); # get Entrez Gene #10 Function: fetch a hash produced by Bio::ASN1::EntrezGene for given Entrez Gene id. Returns: A data structure containing all data items from the Entrez Gene 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
Bio::ASN1::EntrezGene, Bioperl version that contains Stefan Kirov's entrezgene.pm and all dependencies therein.
Same as Bio::ASN1::EntrezGene
For details on various parsers I generated for Entrez Gene, example scripts that uses/benchmarks the modules, please see <http://sourceforge.net/projects/egparser/>. Those other parsers etc. are included in V1.05 download.
Liu, Mingyi, and Andrei Grigoriev. "Fast parsers for Entrez Gene." Bioinformatics 21, no. 14 (2005): 3189-3190.
Any OS that Perl & Bioperl run on.
User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to the Bioperl mailing list. Your participation is much appreciated.
bioperl-l@bioperl.org - General discussion http://bioperl.org/Support.html - About the mailing lists
Please direct usage questions or support issues to the mailing list: bioperl-l@bioperl.org
rather than to the module maintainer directly. Many experienced and reponsive experts will be able look at the problem and quickly address it. Please include a thorough description of the problem with code and data examples if at all possible.
Report bugs to the Bioperl bug tracking system to help us keep track of the bugs and their resolution. Bug reports can be submitted via the web:
https://github.com/bioperl/bio-asn1-entrezgene/issues
Dr. Mingyi Liu <mingyiliu@gmail.com>
This software is copyright (c) 2005 by Mingyi Liu, 2005 by GPC Biotech AG, and 2005 by Altana Research Institute.
This software is available under the same terms as the perl 5 programming language system itself.
| 2021-03-04 | perl v5.32.1 |