Bio::Search::HSP::HSPI(3)

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:

  http://bugzilla.open-bio.org/

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 retreive 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)