Provided by: libbio-perl-perl_1.7.2-2_all 
NAME
Bio::Search::HSP::HSPI - Interface for a High Scoring Pair in a similarity search result
SYNOPSIS
# Bio::Search::HSP::HSPI objects cannot be instantiated since this
# module defines a pure interface.
# Given an object that implements the Bio::Search::HSP::HSPI interface,
# you can do the following things with it:
$r_type = $hsp->algorithm;
$pvalue = $hsp->pvalue();
$evalue = $hsp->evalue();
$frac_id = $hsp->frac_identical( ['query'|'hit'|'total'] );
$frac_cons = $hsp->frac_conserved( ['query'|'hit'|'total'] );
$gaps = $hsp->gaps( ['query'|'hit'|'total'] );
$qseq = $hsp->query_string;
$hseq = $hsp->hit_string;
$homology_string = $hsp->homology_string;
$len = $hsp->length( ['query'|'hit'|'total'] );
$rank = $hsp->rank;
DESCRIPTION
Bio::Search::HSP::HSPI objects cannot be instantiated since this module defines a pure
interface.
Given an object that implements the Bio::Search::HSP::HSPI interface, you can do the
following things with it:
SEE ALSO
This interface inherits methods from these other modules:
Bio::SeqFeatureI, Bio::SeqFeature::FeaturePair Bio::SeqFeature::SimilarityPair
Please refer to these modules for documentation of the many additional inherited methods.
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 - Steve Chervitz, Jason Stajich
Email sac-at-bioperl.org Email jason-at-bioperl.org
COPYRIGHT
Copyright (c) 2001 Steve Chervitz, Jason Stajich. All Rights Reserved.
DISCLAIMER
This software is provided "as is" without warranty of any kind.
APPENDIX
The rest of the documentation details each of the object methods. Internal methods are
usually preceded with a _
algorithm
Title : algorithm
Usage : my $r_type = $hsp->algorithm
Function: Obtain the name of the algorithm used to obtain the HSP
Returns : string (e.g., BLASTP)
Args : none
pvalue
Title : pvalue
Usage : my $pvalue = $hsp->pvalue();
Function: Returns the P-value for this HSP or undef
Returns : float or exponential (2e-10)
P-value is not defined with NCBI Blast2 reports.
Args : none
evalue
Title : evalue
Usage : my $evalue = $hsp->evalue();
Function: Returns the e-value for this HSP
Returns : float or exponential (2e-10)
Args : none
frac_identical
Title : frac_identical
Usage : my $frac_id = $hsp->frac_identical( ['query'|'hit'|'total'] );
Function: Returns the fraction of identitical positions for this HSP
Returns : Float in range 0.0 -> 1.0
Args : 'query' = num identical / length of query seq (without gaps)
'hit' = num identical / length of hit seq (without gaps)
'total' = num identical / length of alignment (with gaps)
default = 'total'
frac_conserved
Title : frac_conserved
Usage : my $frac_cons = $hsp->frac_conserved( ['query'|'hit'|'total'] );
Function : Returns the fraction of conserved positions for this HSP.
This is the fraction of symbols in the alignment with a
positive score.
Returns : Float in range 0.0 -> 1.0
Args : 'query' = num conserved / length of query seq (without gaps)
'hit' = num conserved / length of hit seq (without gaps)
'total' = num conserved / length of alignment (with gaps)
default = 'total'
num_identical
Title : num_identical
Usage : $obj->num_identical($newval)
Function: returns the number of identical residues in the alignment
Returns : integer
Args : integer (optional)
num_conserved
Title : num_conserved
Usage : $obj->num_conserved($newval)
Function: returns the number of conserved residues in the alignment
Returns : inetger
Args : integer (optional)
gaps
Title : gaps
Usage : my $gaps = $hsp->gaps( ['query'|'hit'|'total'] );
Function : Get the number of gap characters in the query, hit, or total alignment.
Returns : Integer, number of gap characters or 0 if none
Args : 'query' = num conserved / length of query seq (without gaps)
'hit' = num conserved / length of hit seq (without gaps)
'total' = num conserved / length of alignment (with gaps)
default = 'total'
query_string
Title : query_string
Usage : my $qseq = $hsp->query_string;
Function: Retrieves the query sequence of this HSP as a string
Returns : string
Args : none
hit_string
Title : hit_string
Usage : my $hseq = $hsp->hit_string;
Function: Retrieves the hit sequence of this HSP as a string
Returns : string
Args : none
homology_string
Title : homology_string
Usage : my $homo_string = $hsp->homology_string;
Function: Retrieves the homology sequence for this HSP as a string.
: The homology sequence is the string of symbols in between the
: query and hit sequences in the alignment indicating the degree
: of conservation (e.g., identical, similar, not similar).
Returns : string
Args : none
length
Title : length
Usage : my $len = $hsp->length( ['query'|'hit'|'total'] );
Function : Returns the length of the query or hit in the alignment (without gaps)
or the aggregate length of the HSP (including gaps;
this may be greater than either hit or query )
Returns : integer
Args : 'query' = length of query seq (without gaps)
'hit' = length of hit seq (without gaps)
'total' = length of alignment (with gaps)
default = 'total'
Args : none
percent_identity
Title : percent_identity
Usage : my $percentid = $hsp->percent_identity()
Function: Returns the calculated percent identity for an HSP
Returns : floating point between 0 and 100
Args : none
get_aln
Title : get_aln
Usage : my $aln = $hsp->get_aln
Function: Returns a Bio::SimpleAlign representing the HSP alignment
Returns : Bio::SimpleAlign
Args : none
seq_inds
Title : seq_inds
Purpose : Get a list of residue positions (indices) for all identical
: or conserved residues in the query or sbjct sequence.
Example : @s_ind = $hsp->seq_inds('query', 'identical');
: @h_ind = $hsp->seq_inds('hit', 'conserved');
: @h_ind = $hsp->seq_inds('hit', 'conserved', 1);
Returns : List of integers
: May include ranges if collapse is true.
Argument : seq_type = 'query' or 'hit' or 'sbjct' (default = query)
('sbjct' is synonymous with 'hit')
class = 'identical' or 'conserved' or 'nomatch' or 'gap'
(default = identical)
(can be shortened to 'id' or 'cons')
collapse = boolean, if true, consecutive positions are merged
using a range notation, e.g., "1 2 3 4 5 7 9 10 11"
collapses to "1-5 7 9-11". This is useful for
consolidating long lists. Default = no collapse.
Throws : n/a.
Comments :
See Also : Bio::Search::BlastUtils::collapse_nums(), Bio::Search::Hit::HitI::seq_inds()
Inherited from Bio::SeqFeature::SimilarityPair
These methods come from Bio::SeqFeature::SimilarityPair
query
Title : query
Usage : my $query = $hsp->query
Function: Returns a SeqFeature representing the query in the HSP
Returns : Bio::SeqFeature::Similarity
Args : [optional] new value to set
hit
Title : hit
Usage : my $hit = $hsp->hit
Function: Returns a SeqFeature representing the hit in the HSP
Returns : Bio::SeqFeature::Similarity
Args : [optional] new value to set
significance
Title : significance
Usage : $evalue = $obj->significance();
$obj->significance($evalue);
Function: Get/Set the significance value (see Bio::SeqFeature::SimilarityPair)
Returns : significance value (scientific notation string)
Args : significance value (sci notation string)
score
Title : score
Usage : my $score = $hsp->score();
Function: Returns the score for this HSP or undef
Returns : numeric
Args : [optional] numeric to set value
bits
Title : bits
Usage : my $bits = $hsp->bits();
Function: Returns the bit value for this HSP or undef
Returns : numeric
Args : none
strand
Title : strand
Usage : $hsp->strand('query')
Function: Retrieves the strand for the HSP component requested
Returns : +1 or -1 (0 if unknown)
Args : 'hit' or 'subject' or 'sbjct' to retrieve the strand of the subject
'query' to retrieve the query strand (default)
'list' or 'array' to retrieve both query and hit together
start
Title : start
Usage : $hsp->start('query')
Function: Retrieves the start for the HSP component requested
Returns : integer
Args : 'hit' or 'subject' or 'sbjct' to retrieve the start of the subject
'query' to retrieve the query start (default)
end
Title : end
Usage : $hsp->end('query')
Function: Retrieves the end for the HSP component requested
Returns : integer
Args : 'hit' or 'subject' or 'sbjct' to retrieve the end of the subject
'query' to retrieve the query end (default)
seq
Usage : $hsp->seq( [seq_type] );
Purpose : Get the query or sbjct sequence as a Bio::Seq.pm object.
Example : $seqObj = $hsp->seq('query');
Returns : Object reference for a Bio::Seq.pm object.
Argument : seq_type = 'query' or 'hit' or 'sbjct' (default = 'query').
: ('sbjct' is synonymous with 'hit')
: default is 'query'
Throws : Propagates any exception that occurs during construction
: of the Bio::Seq.pm object.
Comments : The sequence is returned in an array of strings corresponding
: to the strings in the original format of the Blast alignment.
: (i.e., same spacing).
See Also : "seq_str", "seq_inds", Bio::Seq
seq_str
Usage : $hsp->seq_str( seq_type );
Purpose : Get the full query, sbjct, or 'match' sequence as a string.
: The 'match' sequence is the string of symbols in between the
: query and sbjct sequences.
Example : $str = $hsp->seq_str('query');
Returns : String
Argument : seq_Type = 'query' or 'hit' or 'sbjct' or 'match'
: ('sbjct' is synonymous with 'hit')
: default is 'query'
Throws : Exception if the argument does not match an accepted seq_type.
Comments :
See Also : "seq", "seq_inds", "_set_match_seq"
rank
Usage : $hsp->rank( [string] );
Purpose : Get the rank of the HSP within a given Blast hit.
Example : $rank = $hsp->rank;
Returns : Integer (1..n) corresponding to the order in which the HSP
appears in the BLAST report.
matches
Usage : $hsp->matches(-seq => 'hit'|'query',
-start => $start,
-stop => $stop);
Purpose : Get the total number of identical and conservative matches
: in the query or sbjct sequence for the given HSP. Optionally can
: report data within a defined interval along the seq.
: (Note: 'conservative' matches are called 'positives' in the
: Blast report.)
Example : ($id,$cons) = $hsp_object->matches(-seq => 'hit');
: ($id,$cons) = $hsp_object->matches(-seq => 'query',
-start => 300,
-stop => 400);
Returns : 2-element array of integers
Argument : (1) seq_type = 'query' or 'hit' or 'sbjct' (default = query)
: ('sbjct' is synonymous with 'hit')
: (2) start = Starting coordinate (optional)
: (3) stop = Ending coordinate (optional)
Throws : Exception if the supplied coordinates are out of range.
Comments : Relies on seq_str('match') to get the string of alignment symbols
: between the query and sbjct lines which are used for determining
: the number of identical and conservative matches.
See Also : "length", "gaps", "seq_str", Bio::Search::Hit::BlastHit::_adjust_contigs()
n
Usage : $hsp_obj->n()
Purpose : Get the N value (num HSPs on which P/Expect is based).
: This value is not defined with NCBI Blast2 with gapping.
Returns : Integer or null string if not defined.
Argument : n/a
Throws : n/a
Comments : The 'N' value is listed in parenthesis with P/Expect value:
: e.g., P(3) = 1.2e-30 ---> (N = 3).
: Not defined in NCBI Blast2 with gaps.
: This typically is equal to the number of HSPs but not always.
: To obtain the number of HSPs, use Bio::Search::Hit::HitI::num_hsps().
See Also : Bio::SeqFeature::SimilarityPair::score()
range
Usage : $hsp->range( [seq_type] );
Purpose : Gets the (start, end) coordinates for the query or sbjct sequence
: in the HSP alignment.
Example : ($query_beg, $query_end) = $hsp->range('query');
: ($hit_beg, $hit_end) = $hsp->range('hit');
Returns : Two-element array of integers
Argument : seq_type = string, 'query' or 'hit' or 'sbjct' (default = 'query')
: ('sbjct' is synonymous with 'hit')
Throws : n/a
Comments : This is a convenience method for constructions such as
($hsp->query->start, $hsp->query->end)