NAME
Bio::Assembly::Contig - Perl module to hold and manipulate sequence assembly contigs.
SYNOPSIS
# Module loading
use Bio::Assembly::IO;
# Assembly loading methods
$aio = new Bio::Assembly::IO(-file=>"test.ace.1",
-format=>'phrap');
$assembly = $aio->next_assembly;
foreach $contig ($assembly->all_contigs) {
# do something
}
# OR, if you want to build the contig yourself,
use Bio::Assembly::Contig;
$c = Bio::Assembly::Contig->new(-id=>"1");
$ls = Bio::LocatableSeq->new(-seq=>"ACCG-T",
-id=>"r1",
-alphabet=>'dna');
$ls2 = Bio::LocatableSeq->new(-seq=>"ACA-CG-T",
-id=>"r2",
-alphabet=>'dna');
$ls_coord = Bio::SeqFeature::Generic->new(-start=>3,
-end=>8,
-strand=>1);
$ls2_coord = Bio::SeqFeature::Generic->new(-start=>1,
-end=>8,
-strand=>1);
$c->add_seq($ls);
$c->add_seq($ls2);
$c->set_seq_coord($ls_coord,$ls);
$c->set_seq_coord($ls2_coord,$ls2);
$con = Bio::LocatableSeq->new(-seq=>"ACACCG-T",
-alphabet=>'dna');
$c->set_consensus_sequence($con);
$l = $c->change_coord('unaligned r2','ungapped consensus',6);
print "6 in unaligned r2 => $l in ungapped consensus\n";DESCRIPTION
A contig is as a set of sequences, locally aligned to each other, so that every sequence has overlapping regions with at least one sequence in the contig, such that a continuous of overlapping sequences is formed, allowing the deduction of a consensus sequence which may be longer than any of the sequences from which it was deduced.
In this documentation we refer to the overlapping sequences used to build the contig as "aligned sequences" and to the sequence deduced from the overlap of aligned sequences as the "consensus". Methods to deduce the consensus sequence from aligned sequences were not yet implemented in this module, but its posssible to add a consensus sequence deduced by other means, e.g, by the assembly program used to build the alignment.
All aligned sequences in a Bio::Assembly::Contig must be Bio::Assembly::Locatable objects and have a unique ID. The unique ID restriction is due to the nature of the module's internal data structures and is also a request of some assembly programs. If two sequences with the same ID are added to a contig, the first sequence added is replaced by the second one.
Coordinate_systems
There are four base coordinate systems in Bio::Assembly::Contig. When you need to access contig elements or data that exists on a certain range or location, you may be specifying coordinates in relation to different sequences, which may be either the contig consensus or one of the aligned sequences that were used to do the assembly.
=========================================================
Name | Referenced sequence
---------------------------------------------------------
"gapped consensus" | Contig (with gaps)
"ungapped consensus" | Contig (without gaps)
"aligned $seqID" | sequence $seqID (with gaps)
"unaligned $seqID" | sequence $seqID (without gaps)
========================================================="gapped consensus" refers to positions in the aligned consensus sequence, which is the consensus sequence including the gaps inserted to align it agains the aligned sequences that were used to assemble the contig. So, its limits are [ 1, (consensus length + number of gaps in consensus) ]
"ungapped consensus" is a coordinate system based on the consensus sequence, but excluding consensus gaps. This is just the coordinate system that you have when considering the consensus sequence alone, instead of aligned to other sequences.
"aligned $seqID" refers to locations in the sequence $seqID after alignment of $seqID against the consensus sequence (reverse complementing the original sequence, if needed). Coordinate 1 in "aligned $seqID" is equivalent to the start location (first base) of $seqID in the consensus sequence, just like if the aligned sequence $seqID was a feature of the consensus sequence.
"unaligned $seqID" is equivalent to a location in the isolated sequence, just like you would have when considering the sequence alone, out of an alignment. When changing coordinates from "aligned $seq2" to "unaligned $seq2", if $seq2 was reverse complemented when included in the alignment, the output coordinates will be reversed to fit that fact, i.e. 1 will be changed to length($seq2), 2 will be length($seq)-1 and so on.
An important note: when you change gap coordinates from a gapped system ("gapped consensus" or "aligned $seqID") to a system that does not include gaps ("ungapped consensus" or "unaligned $seqID"), the position returned will be the first location before all gaps neighboring the input location.
Feature_collection
Bio::Assembly::Contig stores much information about a contig in a Bio::Assembly::SeqFeature::Collection object. Relevant information on the alignment is accessed by selecting features based on their primary tags (e.g. all features which have a primary tag of the form '_aligned_coord:$seqID', where $seqID is an aligned sequence ID, are coordinates for sequences in the contig alignment) and, by using methods from Bio::Assembly::SeqFeature::Collection, it's possible to select features by overlap with other features.
We suggest that you use the primary tags of features as identifiers for feature classes. By convention, features with primary tags starting with a '_' are generated by modules that populate the contig data structure and return the contig object, maybe as part of an assembly object, e.g. drivers from the Bio::Assembly::IO set.
Features in the features collection may be associated with particular aligned sequences. To obtain this, you must attach the sequence to the feature, using attach() seq from Bio::Assembly::SeqFeatureI, before you add the feature to the feature collection. We also suggest to add the sequence id to the primary tag, so that is easy to select feature for a particular sequence.
There is only one feature class that some methods in Bio::Assembly::Contig expect to find in the feature collection: features with primary tags of the form '_aligned_coord:$seqID', where $seqID is the aligned sequence id (like returned by $seq->id()). These features describe the position (in "gapped consensus" coordinates) of aligned sequences, and the method set_seq_coord() automatically changes a feature's primary tag to this form whenever the feature is added to the collection by this method. Only two methods in Bio::Assembly::Contig will not work unless there are features from this class: change_coord() and get_seq_coord().
Other feature classes will be automatically available only when Bio::Assembly::Contig objects are created by a specific module. Such feature classes are (or should be) documented in the documentation of the module which create them, to which the user should refer.
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 lists Your participation is much appreciated.
bioperl-l@bioperl.org - General discussion
http://bioperl.org/wiki/Mailing_lists - About the mailing listsReporting Bugs
Report bugs to the Bioperl bug tracking system to help us keep track the bugs and their resolution. Bug reports can be submitted via the web:
http://bugzilla.open-bio.org/AUTHOR - Robson Francisco de Souza
rfsouza@citri.iq.usp.br
APPENDIX
The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
Object creator
new
Title : new
Usage : my $contig = new Bio::Assembly::Contig();
Function : Creates a new contig object
Returns : Bio::Assembly::Contig
Args : -source => string representing the source
program where this contig came
from
-id => contig unique IDAssembly related methods
These methods exist to enable adding information about possible relations among contigs, e.g. when you already have a scaffold for your assembly, describing the ordering of contigs in the final assembly, but no sequences covering the gaps between neighboring contigs.
source
Title : source
Usage : $contig->source($program);
Function : Get/Set program used to build this contig
Returns : string
Argument : [optional] stringassembly
Title : assembly
Usage : $contig->assembly($assembly);
Function : Get/Set assembly object for this contig
Returns : a Bio::Assembly::Scaffold object
Argument : a Bio::Assembly::Scaffold objectstrand
Title : strand
Usage : $contig->strand($num);
Function : Get/Set contig orientation in a scaffold/assembly.
Its equivalent to the strand property of sequence
objects and sets whether the contig consensus should
be reversed and complemented before being added to a
scaffold or assembly.
Returns : integer
Argument : 1 if orientaion is forward, -1 if reverse and
0 if noneupstream_neighbor
Title : upstream_neighbor
Usage : $contig->upstream_neighbor($contig);
Function : Get/Set a contig neighbor for the current contig when
building a scaffold. The upstream neighbor is
located before $contig first base
Returns : nothing
Argument : Bio::Assembly::Contigdownstream_neighbor
Title : downstream_neighbor
Usage : $contig->downstream_neighbor($num);
Function : Get/Set a contig neighbor for the current contig when
building a scaffold. The downstream neighbor is
located after $contig last base
Returns : nothing
Argument : Bio::Assembly::ContigContig feature collection methods
add_features
Title : add_features
Usage : $contig->add_features($feat,$flag)
Function :
Add an array of features to the contig feature
collection. The consensus sequence may be attached to the
added feature, if $flag is set to 1. If $flag is 0 and
the feature attached to one of the contig aligned
sequences, the feature is registered as an aligned
sequence feature. If $flag is 0 and the feature is not
attched to any sequence in the contig, the feature is
simply added to the feature collection and no attachment
or registration is made.
Note: You must attach aligned sequences to their features
prior to calling add_features, otherwise you won't be
able to access the feature through get_seq_feat_by_tag()
method.
Returns : number of features added.
Argument :
$feat : A reference to an array of Bio::SeqFeatureI
$flag : boolean - true if consensus sequence object
should be attached to this feature, false if
no consensus attachment should be made.
Default: false.remove_features
Title : remove_features
Usage : $contig->remove_features(@feat)
Function : Remove an array of contig features
Returns : number of features removed.
Argument : An array of Bio::SeqFeatureIget_features_collection
Title : get_features_collection
Usage : $contig->get_features_collection()
Function : Get the collection of all contig features
Returns : Bio::SeqFeature::Collection
Argument : noneCoordinate system's related methods
See Coordinate_Systems above.
change_coord
Title : change_coord
Usage : $contig->change_coord($in,$out,$query)
Function :
Change coordinate system for $query. This method
transforms locations between coordinate systems described
in section "Coordinate Systems" of this document.
Note: this method will throw an exception when changing
coordinates between "ungapped consensus" and other
systems if consensus sequence was not set. It will also
throw exceptions when changing coordinates among aligned
sequence, either with or without gaps, and other systems
if sequence locations were not set with set_seq_coord().
Returns : integer
Argument :
$in : [string] input coordinate system
$out : [string] output coordinate system
$query : [integer] a position in a sequenceget_seq_coord
Title : get_seq_coord
Usage : $contig->get_seq_coord($seq);
Function : Get "gapped consensus" location for aligned sequence
Returns : Bio::SeqFeature::Generic for coordinates or undef.
A warning is printed if sequence coordinates were not set.
Argument : Bio::LocatabaleSeq objectset_seq_coord
Title : set_seq_coord
Usage : $contig->set_seq_coord($feat,$seq);
Function :
Set "gapped consensus" location for an aligned
sequence. If the sequence was previously added using
add_seq, its coordinates are changed/set. Otherwise,
add_seq is called and the sequence is added to the
contig.
Returns : Bio::SeqFeature::Generic for old coordinates or undef.
Argument :
$feat : a Bio::SeqFeature::Generic object
representing a location for the
aligned sequence, in "gapped
consensus" coordinates.
Note: the original feature primary tag will
be lost.
$seq : a Bio::LocatabaleSeq objectBio::Assembly::Contig consensus methods
set_consensus_sequence
Title : set_consensus_sequence
Usage : $contig->set_consensus_sequence($seq)
Function : Set the consensus sequence object for this contig
Returns : consensus length
Argument : Bio::LocatableSeqset_consensus_quality
Title : set_consensus_quality
Usage : $contig->set_consensus_quality($qual)
Function : Set the quality object for consensus sequence
Returns : nothing
Argument : Bio::Seq::QualI objectget_consensus_length
Title : get_consensus_length
Usage : $contig->get_consensus_length()
Function : Get consensus sequence length
Returns : integer
Argument : noneget_consensus_sequence
Title : get_consensus_sequence
Usage : $contig->get_consensus_sequence()
Function : Get a reference to the consensus sequence object
for this contig
Returns : Bio::SeqI object
Argument : noneget_consensus_quality
Title : get_consensus_quality
Usage : $contig->get_consensus_quality()
Function : Get a reference to the consensus quality object
for this contig.
Returns : A Bio::QualI object
Argument : noneBio::Assembly::Contig aligned sequences methods
set_seq_qual
Title : set_seq_qual
Usage : $contig->set_seq_qual($seq,$qual);
Function : Adds quality to an aligned sequence.
Returns : nothing
Argument : a Bio::LocatableSeq object and
a Bio::Seq::QualI objectSee Bio::LocatableSeq for more information.
get_seq_ids
Title : get_seq_ids
Usage : $contig->get_seq_ids(-start=>$start,
-end=>$end,
-type=>"gapped A0QR67B08.b");
Function : Get list of sequence IDs overlapping inteval [$start, $end]
The default interval is [1,$contig->length]
Default coordinate system is "gapped contig"
Returns : An array
Argument : A hash with optional elements:
-start : consensus subsequence start
-end : consensus subsequence end
-type : the coordinate system type for $start and $end arguments
Coordinate system avaliable are:
"gapped consensus" : consensus coordinates with gaps
"ungapped consensus" : consensus coordinates without gaps
"aligned $ReadID" : read $ReadID coordinates with gaps
"unaligned $ReadID" : read $ReadID coordinates without gapsget_seq_feat_by_tag
Title : get_seq_feat_by_tag
Usage : $seq = $contig->get_seq_feat_by_tag($seq,"_aligned_coord:$seqID")
Function :
Get a sequence feature based on its primary_tag.
When you add
Returns : a Bio::SeqFeature object
Argument : a Bio::LocatableSeq and a string (feature primary tag)get_seq_by_name
Title : get_seq_by_name
Usage : $seq = $contig->get_seq_by_name('Seq1')
Function : Gets a sequence based on its id.
Returns : a Bio::LocatableSeq object
undef if name is not found
Argument : stringget_qual_by_name
Title : get_qual_by_name
Usage : $seq = $contig->get_qual_by_name('Seq1')
Function :
Gets Bio::Seq::QualI object for a sequence
through its id ( as given by $qual->id() ).
Returns : a Bio::Seq::QualI object.
undef if name is not found
Argument : stringBio::Align::AlignI compatible methods
Modifier methods
These methods modify the MSE by adding, removing or shuffling complete sequences.
add_seq
Title : add_seq
Usage : $contig->add_seq($newseq);
Function :
Adds a sequence to the contig. *Does*
*not* align it - just adds it to the
hashes.
Returns : nothing
Argument : a Bio::LocatableSeq objectSee Bio::LocatableSeq for more information.
remove_seq
Title : remove_seq
Usage : $contig->remove_seq($seq);
Function : Removes a single sequence from an alignment
Returns : 1 on success, 0 otherwise
Argument : a Bio::LocatableSeq objectpurge
Title : purge
Usage : $contig->purge(0.7);
Function:
Removes sequences above whatever %id.
This function will grind on large alignments. Beware!
(perhaps not ideally implemented)
Example :
Returns : An array of the removed sequences
Argument:sort_alphabetically
Title : sort_alphabetically
Usage : $contig->sort_alphabetically
Function :
Changes the order of the alignemnt to alphabetical on name
followed by numerical by number.
Returns :
Argument :Sequence selection methods
Methods returning one or more sequences objects.
each_seq
Title : each_seq
Usage : foreach $seq ( $contig->each_seq() )
Function : Gets an array of Seq objects from the alignment
Returns : an array
Argument :each_alphabetically
Title : each_alphabetically
Usage : foreach $seq ( $contig->each_alphabetically() )
Function :
Returns an array of sequence object sorted alphabetically
by name and then by start point.
Does not change the order of the alignment
Returns :
Argument :each_seq_with_id
Title : each_seq_with_id
Usage : foreach $seq ( $contig->each_seq_with_id() )
Function :
Gets an array of Seq objects from the
alignment, the contents being those sequences
with the given name (there may be more than one)
Returns : an array
Argument : a seq nameget_seq_by_pos
Title : get_seq_by_pos
Usage : $seq = $contig->get_seq_by_pos(3)
Function :
Gets a sequence based on its position in the alignment.
Numbering starts from 1. Sequence positions larger than
no_sequences() will thow an error.
Returns : a Bio::LocatableSeq object
Argument : positive integer for the sequence ositionCreate new alignments
The result of these methods are horizontal or vertical subsets of the current MSE.
select
Title : select
Usage : $contig2 = $contig->select(1, 3) # three first sequences
Function :
Creates a new alignment from a continuous subset of
sequences. Numbering starts from 1. Sequence positions
larger than no_sequences() will thow an error.
Returns : a Bio::Assembly::Contig object
Argument : positive integer for the first sequence
positive integer for the last sequence to include (optional)select_noncont
Title : select_noncont
Usage : $contig2 = $contig->select_noncont(1, 3) # first and 3rd sequences
Function :
Creates a new alignment from a subset of
sequences. Numbering starts from 1. Sequence positions
larger than no_sequences() will thow an error.
Returns : a Bio::Assembly::Contig object
Args : array of integers for the sequencesslice
Title : slice
Usage : $contig2 = $contig->slice(20, 30)
Function :
Creates a slice from the alignment inclusive of start and
end columns. Sequences with no residues in the slice are
excluded from the new alignment and a warning is printed.
Slice beyond the length of the sequence does not do
padding.
Returns : a Bio::Assembly::Contig object
Argument : positive integer for start column
positive integer for end columnChange sequences within the MSE
These methods affect characters in all sequences without changeing the alignment.
map_chars
Title : map_chars
Usage : $contig->map_chars('\.','-')
Function :
Does a s/$arg1/$arg2/ on the sequences. Useful for gap
characters
Notice that the from (arg1) is interpretted as a regex,
so be careful about quoting meta characters (eg
$contig->map_chars('.','-') wont do what you want)
Returns :
Argument : 'from' rexexp
'to' stringuppercase
Title : uppercase()
Usage : $contig->uppercase()
Function : Sets all the sequences to uppercase
Returns :
Argument :match_line
Title : match_line()
Usage : $contig->match_line()
Function : Generates a match line - much like consensus string
except that a line indicating the '*' for a match.
Argument : (optional) Match line characters ('*' by default)
(optional) Strong match char (':' by default)
(optional) Weak match char ('.' by default)match
Title : match()
Usage : $contig->match()
Function :
Goes through all columns and changes residues that are
identical to residue in first sequence to match '.'
character. Sets match_char.
USE WITH CARE: Most MSE formats do not support match
characters in sequences, so this is mostly for output
only. NEXUS format (Bio::AlignIO::nexus) can handle
it.
Returns : 1
Argument : a match character, optional, defaults to '.'unmatch
Title : unmatch()
Usage : $contig->unmatch()
Function :
Undoes the effect of method match. Unsets match_char.
Returns : 1
Argument : a match character, optional, defaults to '.'MSE attibutes
Methods for setting and reading the MSE attributes.
Note that the methods defining character semantics depend on the user to set them sensibly. They are needed only by certain input/output methods. Unset them by setting to an empty string ('').
id
Title : id
Usage : $contig->id("Ig")
Function : Gets/sets the id field of the alignment
Returns : An id string
Argument : An id string (optional)missing_char
Title : missing_char
Usage : $contig->missing_char("?")
Function : Gets/sets the missing_char attribute of the alignment
It is generally recommended to set it to 'n' or 'N'
for nucleotides and to 'X' for protein.
Returns : An missing_char string,
Argument : An missing_char string (optional)match_char
Title : match_char
Usage : $contig->match_char('.')
Function : Gets/sets the match_char attribute of the alignment
Returns : An match_char string,
Argument : An match_char string (optional)gap_char
Title : gap_char
Usage : $contig->gap_char('-')
Function : Gets/sets the gap_char attribute of the alignment
Returns : An gap_char string, defaults to '-'
Argument : An gap_char string (optional)symbol_chars
Title : symbol_chars
Usage : my @symbolchars = $contig->symbol_chars;
Function: Returns all the seen symbols (other than gaps)
Returns : array of characters that are the seen symbols
Argument: boolean to include the gap/missing/match charactersAlignment descriptors
These read only methods describe the MSE in various ways.
consensus_string
Title : consensus_string
Usage : $str = $contig->consensus_string($threshold_percent)
Function : Makes a strict consensus
Returns :
Argument : Optional treshold ranging from 0 to 100.
The consensus residue has to appear at least threshold %
of the sequences at a given location, otherwise a '?'
character will be placed at that location.
(Default value = 0%)consensus_iupac
Title : consensus_iupac
Usage : $str = $contig->consensus_iupac()
Function :
Makes a consensus using IUPAC ambiguity codes from DNA
and RNA. The output is in upper case except when gaps in
a column force output to be in lower case.
Note that if your alignment sequences contain a lot of
IUPAC ambiquity codes you often have to manually set
alphabet. Bio::PrimarySeq::_guess_type thinks they
indicate a protein sequence.
Returns : consensus string
Argument : none
Throws : on protein sequencesis_flush
Title : is_flush
Usage : if( $contig->is_flush() )
:
:
Function : Tells you whether the alignment
: is flush, ie all of the same length
:
:
Returns : 1 or 0
Argument :length
Title : length()
Usage : $len = $contig->length()
Function : Returns the maximum length of the alignment.
To be sure the alignment is a block, use is_flush
Returns :
Argument :maxdisplayname_length
Title : maxdisplayname_length
Usage : $contig->maxdisplayname_length()
Function :
Gets the maximum length of the displayname in the
alignment. Used in writing out various MSE formats.
Returns : integer
Argument :no_residues
Title : no_residues
Usage : $no = $contig->no_residues
Function : number of residues in total in the alignment
Returns : integer
Argument :no_sequences
Title : no_sequences
Usage : $depth = $contig->no_sequences
Function : number of sequence in the sequence alignment
Returns : integer
Argument : Nonepercentage_identity
Title : percentage_identity
Usage : $id = $contig->percentage_identity
Function: The function calculates the percentage identity of the alignment
Returns : The percentage identity of the alignment (as defined by the
implementation)
Argument: Noneoverall_percentage_identity
Title : percentage_identity
Usage : $id = $contig->percentage_identity
Function: The function calculates the percentage identity of
the conserved columns
Returns : The percentage identity of the conserved columns
Args : Noneaverage_percentage_identity
Title : average_percentage_identity
Usage : $id = $contig->average_percentage_identity
Function: The function uses a fast method to calculate the average
percentage identity of the alignment
Returns : The average percentage identity of the alignment
Args : NoneAlignment positions
Methods to map a sequence position into an alignment column and back. column_from_residue_number() does the former. The latter is really a property of the sequence object and can done using Bio::LocatableSeq::location_from_column:
# select somehow a sequence from the alignment, e.g.
my $seq = $contig->get_seq_by_pos(1);
#$loc is undef or Bio::LocationI object
my $loc = $seq->location_from_column(5);column_from_residue_number
Title : column_from_residue_number
Usage : $col = $contig->column_from_residue_number( $seqname, $resnumber)
Function:
This function gives the position in the alignment
(i.e. column number) of the given residue number in the
sequence with the given name. For example, for the
alignment
Seq1/91-97 AC..DEF.GH
Seq2/24-30 ACGG.RTY..
Seq3/43-51 AC.DDEFGHI
column_from_residue_number( "Seq1", 94 ) returns 5.
column_from_residue_number( "Seq2", 25 ) returns 2.
column_from_residue_number( "Seq3", 50 ) returns 9.
An exception is thrown if the residue number would lie
outside the length of the aligment
(e.g. column_from_residue_number( "Seq2", 22 )
Note: If the the parent sequence is represented by more than
one alignment sequence and the residue number is present in
them, this method finds only the first one.
Returns : A column number for the position in the alignment of the
given residue in the given sequence (1 = first column)
Args : A sequence id/name (not a name/start-end)
A residue number in the whole sequence (not just that
segment of it in the alignment)Sequence names
Methods to manipulate the display name. The default name based on the sequence id and subsequence positions can be overridden in various ways.
displayname
Title : displayname
Usage : $contig->displayname("Ig", "IgA")
Function : Gets/sets the display name of a sequence in the alignment
:
Returns : A display name string
Argument : name of the sequence
displayname of the sequence (optional)set_displayname_count
Title : set_displayname_count
Usage : $contig->set_displayname_count
Function :
Sets the names to be name_# where # is the number of
times this name has been used.
Returns : None
Argument : Noneset_displayname_flat
Title : set_displayname_flat
Usage : $contig->set_displayname_flat()
Function : Makes all the sequences be displayed as just their name,
not name/start-end
Returns : 1
Argument : Noneset_displayname_normal
Title : set_displayname_normal
Usage : $contig->set_displayname_normal()
Function : Makes all the sequences be displayed as name/start-end
Returns : None
Argument : NoneInternal Methods
_binary_search
Title : _binary_search
Usage : _binary_search($list,$query)
Function :
Find a number in a sorted list of numbers. Return values
may be on or two integers. One positive integer or zero
(>=0) is the index of the element that stores the queried
value. Two positive integers (or zero and another
number) are the indexes of elements among which the
queried value should be placed. Negative single values
mean:
-1: $query is smaller than smallest element in list
-2: $query is greater than greatest element in list
Returns : array of integers
Argument :
$list : array reference
$query : integer_compare
Title : _compare
Usage : _compare($arg1,$arg2)
Function: Perform numeric or string comparisons
Returns : integer (0, 1 or -1)
Args : values to be compared_nof_gaps
Title : _nof_gaps
Usage : _nof_gaps($array_ref, $query)
Function: number of gaps found before position $query
Returns : integer
Args :
$array_ref : gap registry reference
$query : [integer] a position in a sequence_padded_unpadded
Title : _padded_unpadded
Usage : _padded_unpadded($array_ref, $query)
Function:
Returns a coordinate corresponding to
position $query after gaps were
removed from a sequence.
Returns : integer
Args :
$array_ref : reference to this gap registry
$query : [integer] coordionate to change_unpadded_padded
Title : _unpadded_padded
Usage : _unpadded_padded($array_ref, $query)
Function:
Returns the value corresponding to
ungapped position $query when gaps are
counted as valid sites in a sequence
Returns :
Args : $array_ref = a reference to this sequence's gap registry
$query = [integer] location to change_register_gaps
Title : _register_gaps
Usage : $self->_register_gaps($seq, $array_ref)
Function: stores gap locations for a sequence
Returns : number of gaps found
Args :
$seq : sequence string
$array_ref : a reference to an array,
where gap locations will
be stored