Bio::Range(3)

NAME
Bio::Range - Pure perl RangeI implementation

SYNOPSIS
  $range = new Bio::Range(-start=>10, -end=>30, -strand=>+1);
  $r2 = new Bio::Range(-start=>15, -end=>200, -strand=>+1);

  print join(', ', $range->union($r2)), "\n";
  print join(', ', $range->intersection($r2)), "\n";

  print $range->overlaps($r2), "\n";
  print $range->contains($r2), "\n";

DESCRIPTION
This provides a pure perl implementation of the BioPerl range interface.

Ranges are modeled as having (start, end, length, strand). They use Bio-coordinates - all points >= start and <= end are within the range. End is always greater-than or equal-to start, and length is greather than or equal to 1. The behaviour of a range is undefined if ranges with negative numbers or zero are used.

So, in summary:

  length = end - start + 1
  end >= start
  strand = (-1 | 0 | +1)

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 one of the Bioperl mailing lists. Your participation is much appreciated.

  bioperl-l@bioperl.org                         - General discussion
  http://bio.perl.org/MailList.html             - About the mailing lists

  Reporting 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.bioperl.org/

AUTHOR - Heikki Lehvaslaiho
Email heikki@ebi.ac.uk

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

Constructors

  new
  Title   : new
  Usage   : $range = Bio::Range->new(-start => 100, -end=> 200, -strand = +1);
  Function: generates a new Bio::Range
  Returns : a new range
  Args    : -strand (defaults to 0) and any two of (-start, -end, -length),
            the third will be calculated

  unions
 Title   : unions
 Usage   : @unions = Bio::Range->unions(@ranges);
 Function: generate a list of non-intersecting Bio::Range objects
           from a list of Bio::Range objects which may intersect
 Returns : a list of Bio::Range objects
 Args    : a list of Bio::Range objects

Member variable access
These methods let you get at and set the member variables

  start
  Title    : start
  Function : return or set the start co-ordinate
  Example  : $s = $range->start(); $range->start(7);
  Returns  : the value of the start co-ordinate
  Args     : optionally, the new start co-ordinate
  Overrides: Bio::RangeI::start

  end
  Title    : end
  Function : return or set the end co-ordinate
  Example  : $e = $range->end(); $range->end(2000);
  Returns  : the value of the end co-ordinate
  Args     : optionally, the new end co-ordinate
  Overrides: Bio::RangeI::end

  strand
  Title    : strand
  Function : return or set the strandedness
  Example  : $st = $range->strand(); $range->strand(-1);
  Returns  : the value of the strandedness (-1, 0 or 1)
  Args     : optionally, the new strand - (-1, 0, 1) or (-, ., +).
  Overrides: Bio::RangeI::Strand

  length
  Title    : length
  Function : returns the length of this range
  Example  : $length = $range->length();
  Returns  : the length of this range, equal to end - start + 1
  Args     : if you attempt to set the length an exception will be thrown
  Overrides: Bio::RangeI::Length

  toString
  Title   : toString
  Function: stringifies this range
  Example : print $range->toString(), "\n";
  Returns : a string representation of this range

Boolean Methods
These methods return true or false.

 $range->overlaps($otherRange) && print "Ranges overlap\n";

  overlaps
  Title    : overlaps
  Usage    : if($r1->overlaps($r2)) { do stuff }
  Function : tests if $r2 overlaps $r1
  Args     : a range to test for overlap with
  Returns  : true if the ranges overlap, false otherwise
  Inherited: Bio::RangeI

  contains
  Title    : contains
  Usage    : if($r1->contains($r2) { do stuff }
  Function : tests wether $r1 totally contains $r2
  Args     : a range to test for being contained
  Returns  : true if the argument is totally contained within this range
  Inherited: Bio::RangeI

  equals
  Title    : equals
  Usage    : if($r1->equals($r2))
  Function : test whether $r1 has the same start, end, length as $r2
  Args     : a range to test for equality
  Returns  : true if they are describing the same range
  Inherited: Bio::RangeI

Geometrical methods
These methods do things to the geometry of ranges, and return triplets (start, end, strand) from which new ranges could be built.

  intersection
  Title    : intersection
  Usage    : ($start, $stop, $strand) = $r1->intersection($r2)
  Function : gives the range that is contained by both ranges
  Args     : a range to compare this one to
  Returns  : nothing if they do not overlap, or the range that they do overlap
  Inherited: Bio::RangeI::intersection

  union
  Title    : union
  Usage    : ($start, $stop, $strand) = $r1->union($r2);
           : ($start, $stop, $strand) = Bio::Range->union(@ranges);
  Function : finds the minimal range that contains all of the ranges
  Args     : a range or list of ranges
  Returns  : the range containing all of the ranges
  Inherited: Bio::RangeI::union