NAME

Bio::Search::Hit::ModelHit - A model-based implementation of the Bio::Search::Hit::HitI interface

SYNOPSIS

use Bio::Search::Hit::ModelHit;
my $hit = Bio::Search::Hit::ModelHit->new(-algorithm => 'rnamotif');

# typically one gets HitI objects from a SearchIO stream via a ResultI
use Bio::SearchIO;
my $parser = Bio::SearchIO->new(-format => 'infernal', -file => 'trap.inf');

my $result = $parser->next_result;
my $hit    = $result->next_hit;

DESCRIPTION

This object handles the hit data from a database search using models or descriptors instead of sequences, such as Infernal, HMMER, RNAMotif, etc.

Unless you're writing a parser, you won't ever need to create a ModelHit or any other HitI-implementing object. If you use the SearchIO system, HitI objects are created automatically from a SearchIO stream which returns Bio::Search::Hit::HitI objects.

Note that several HitI-based methods have been overridden from ModelHit due to their unreliability when dealing with queries that aren't sequence-based. It may be possible to reimplement these at a later point, but for the time being they will throw warnings and return w/o results.

For documentation on what you can do with ModelHit (and other HitI objects), please see the API documentation in Bio::Search::Hit::HitI.

FEEDBACK

Mailing Lists

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/wiki/Mailing_lists  - About the mailing lists

Support

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.

Reporting Bugs

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/bioperl-live/issues

AUTHOR - Chris Fields

Email cjfields at bioperl dot org

APPENDIX

The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _

HitI methods implemented in parent class Bio::Search::Hit::ModelHit

new

Title   : new
Usage   : my $obj = Bio::Search::Hit::ModelHit->new();
Function: Builds a new Bio::Search::Hit::ModelHit object
Returns : Bio::Search::Hit::ModelHit
Args    : -name         => Name of Hit (required)
          -description  => Description (optional)
          -accession    => Accession number (optional)
          -ncbi_gi      => NCBI GI UID (optional)
          -length       => Length of the Hit (optional)
          -score        => Raw Score for the Hit (optional)
          -bits         => Bit Score for the Hit (optional)
          -significance => Significance value for the Hit (optional)
          -algorithm    => Algorithm used (BLASTP, FASTX, etc...)
          -hsps         => Array ref of HSPs for this Hit.
          -found_again  => boolean, true if hit appears in a
                           "previously found" section of a PSI-Blast report.
          -hsp_factory  => Bio::Factory::ObjectFactoryI able to create HSPI
                           objects.

add_hsp

Title   : add_hsp
Usage   : $hit->add_hsp($hsp)
Function: Add a HSP to the collection of HSPs for a Hit
Returns : number of HSPs in the Hit
Args    : Bio::Search::HSP::HSPI object, OR hash ref containing data suitable
          for creating a HSPI object (&hsp_factory must be set to get it back)

hsp_factory

Title   : hsp_factory
Usage   : $hit->hsp_factory($hsp_factory)
Function: Get/set the factory used to build HSPI objects if necessary.
Returns : Bio::Factory::ObjectFactoryI
Args    : Bio::Factory::ObjectFactoryI

Bio::Search::Hit::HitI methods

Implementation of Bio::Search::Hit::HitI methods

name

Title   : name
Usage   : $hit_name = $hit->name();
Function: returns the name of the Hit sequence
Returns : a scalar string
Args    : [optional] scalar string to set the name

accession

Title   : accession
Usage   : $acc = $hit->accession();
Function: Retrieve the accession (if available) for the hit
Returns : a scalar string (empty string if not set)
Args    : none

description

Title   : description
Usage   : $desc = $hit->description();
Function: Retrieve the description for the hit
Returns : a scalar string
Args    : [optional] scalar string to set the descrition

length

Title   : length
Usage   : my $len = $hit->length
Function: Returns the length of the hit
Returns : integer
Args    : [optional] integer to set the length

algorithm

Title   : algorithm
Usage   : $alg = $hit->algorithm();
Function: Gets the algorithm specification that was used to obtain the hit
          For BLAST, the algorithm denotes what type of sequence was aligned
          against what (BLASTN: dna-dna, BLASTP prt-prt, BLASTX translated
          dna-prt, TBLASTN prt-translated dna, TBLASTX translated
          dna-translated dna).
Returns : a scalar string
Args    : [optional] scalar string to set the algorithm

raw_score

Title   : raw_score
Usage   : $score = $hit->raw_score();
Function: Gets the "raw score" generated by the algorithm.  What
          this score is exactly will vary from algorithm to algorithm,
          returning undef if unavailable.
Returns : a scalar value
Args    : [optional] scalar value to set the raw score

score

Equivalent to raw_score()

significance

Title   : significance
Usage   : $significance = $hit->significance();
Function: Used to obtain the E or P value of a hit, i.e. the probability that
          this particular hit was obtained purely by random chance.  If
          information is not available (nor calculatable from other
          information sources), return undef.
Returns : a scalar value or undef if unavailable
Args    : [optional] scalar value to set the significance

bits

Usage     : $hit_object->bits();
Purpose   : Gets the bit score of the best HSP for the current hit.
Example   : $bits = $hit_object->bits();
Returns   : Integer or undef if bit score is not set
Argument  : n/a
Comments  : For BLAST1, the non-bit score is listed in the summary line.

See Also : score()

next_hsp

Title    : next_hsp
Usage    : while( $hsp = $obj->next_hsp()) { ... }
Function : Returns the next available High Scoring Pair
Example  :
Returns  : Bio::Search::HSP::HSPI object or null if finished
Args     : none

hsps

Usage     : $hit_object->hsps();
Purpose   : Get a list containing all HSP objects.
          : Get the numbers of HSPs for the current hit.
Example   : @hsps = $hit_object->hsps();
          : $num  = $hit_object->hsps();  # alternatively, use num_hsps()
Returns   : Array context : list of Bio::Search::HSP::BlastHSP.pm objects.
          : Scalar context: integer (number of HSPs).
          :                 (Equivalent to num_hsps()).
Argument  : n/a. Relies on wantarray
Throws    : Exception if the HSPs have not been collected.

See Also : hsp(), num_hsps()

num_hsps

Usage     : $hit_object->num_hsps();
Purpose   : Get the number of HSPs for the present hit.
Example   : $nhsps = $hit_object->num_hsps();
Returns   : Integer or '-' if HSPs have not been callected
Argument  : n/a

See Also : hsps()

rewind

Title   : rewind
Usage   : $hit->rewind;
Function: Allow one to reset the HSP iterator to the beginning
          Since this is an in-memory implementation
Returns : none
Args    : none

ambiguous_aln

Usage     : $ambig_code = $hit_object->ambiguous_aln();
Purpose   : Sets/Gets ambiguity code data member.
Example   : (see usage)
Returns   : String = 'q', 's', 'qs', '-'
          :   'q'  = query sequence contains overlapping sub-sequences
          :          while sbjct does not.
          :   's'  = sbjct sequence contains overlapping sub-sequences
          :          while query does not.
          :   'qs' = query and sbjct sequence contains overlapping sub-sequences
          :          relative to each other.
          :   '-'  = query and sbjct sequence do not contains multiple domains
          :          relative to each other OR both contain the same distribution
          :          of similar domains.
Argument  : n/a
Throws    : n/a
Comment   : Note: "sbjct" is synonymous with "hit"

overlap

See documentation in Bio::Search::Hit::HitI::overlap()

n

Usage     : $hit_object->n();
Purpose   : Gets the N number for the current hit.
          : This is the number of HSPs in the set which was ascribed
          : the lowest P-value (listed on the description line).
          : This number is not the same as the total number of HSPs.
          : To get the total number of HSPs, use num_hsps().
Example   : $n = $hit_object->n();
Returns   : Integer
Argument  : n/a
Throws    : Exception if HSPs have not been set.
Comments  : Calling n() on such reports will result in a call to num_hsps().
          : The num_hsps() method will count the actual number of
          : HSPs in the alignment listing, which may exceed N in
          : some cases.

See Also : num_hsps()

p

Usage     : $hit_object->p( [format] );
Purpose   : Get the P-value for the best HSP
Example   : $p =  $sbjct->p;
          : $p =  $sbjct->p('exp');  # get exponent only.
          : ($num, $exp) =  $sbjct->p('parts');  # split sci notation into parts
Returns   : Float or scientific notation number (the raw P-value, DEFAULT).
          : Integer if format == 'exp' (the magnitude of the base 10 exponent).
          : 2-element list (float, int) if format == 'parts' and P-value
          :                is in scientific notation (See Comments).
Argument  : format: string of 'raw' | 'exp' | 'parts'
          :    'raw' returns value given in report. Default. (1.2e-34)
          :    'exp' returns exponent value only (34)
          :    'parts' returns the decimal and exponent as a
          :            2-element list (1.2, -34) (See Comments).
Throws    : Warns if no P-value is defined. Uses expect instead.
Comments  : Using the 'parts' argument is not recommended since it will not
          : work as expected if the P-value is not in scientific notation.
          : That is, floats are not converted into sci notation before
          : splitting into parts.

See Also : expect(), signif(), Bio::Search::SearchUtils::get_exponent()

hsp

Usage     : $hit_object->hsp( [string] );
Purpose   : Get a single HSPI object for the present HitI object.
Example   : $hspObj  = $hit_object->hsp;  # same as 'best'
          : $hspObj  = $hit_object->hsp('best');
          : $hspObj  = $hit_object->hsp('worst');
Returns   : Object reference for a Bio::Search::HSP::BlastHSP.pm object.
Argument  : String (or no argument).
          :   No argument (default) = highest scoring HSP (same as 'best').
          :   'best' or 'first' = highest scoring HSP.
          :   'worst' or 'last' = lowest scoring HSP.
Throws    : Exception if the HSPs have not been collected.
          : Exception if an unrecognized argument is used.

See Also : hsps(), num_hsps()

rank

Title   : rank
Usage   : $obj->rank($newval)
Function: Get/Set the rank of this Hit in the Query search list
          i.e. this is the Nth hit for a specific query
Returns : value of rank
Args    : newvalue (optional)

locus

Title   : locus
Usage   : $locus = $hit->locus();
Function: Retrieve the locus (if available) for the hit
Returns : a scalar string (empty string if not set)
Args    : none

each_accession_number

Title   : each_accession_number
Usage   : @each_accession_number = $hit->each_accession_number();
Function: Get each accession number listed in the description of the hit.
          If there are no alternatives, then only the primary accession will
          be given
Returns : list of all accession numbers in the description
Args    : none

tiled_hsps

See documentation in Bio::Search::SearchUtils::tile_hsps()

query_length

Title   : query_length
Usage   : $obj->query_length($newval)
Function: Get/Set the query_length
Returns : value of query_length (a scalar)
Args    : on set, new value (a scalar or undef, optional)

ncbi_gi

Title   : ncbi_gi
Usage   : $acc = $hit->ncbi_gi();
Function: Retrieve the NCBI Unique ID (aka the GI #),
          if available, for the hit
Returns : a scalar string (empty string if not set)
Args    : none

ModelHit methods overridden in ModelHit

The following methods have been overridden due to their current reliance on sequence-based queries. They may be implemented in future versions of this class.

length_aln

gaps

matches

start

end

range

frac_identical

frac_conserved

frac_aligned_query

frac_aligned_hit

num_unaligned_hit

num_unaligned_query

seq_inds

strand

frame

logical_length

cpanm Bio::Seq

perl -MCPAN -e shell
install Bio::Seq