class Bio::Features

DESCRIPTION

This class is OBSOLETED, and will soon be removed. Instead of this class, an array is to be used.

Container for a list of Feature objects.

USAGE

# First, create some Bio::Feature objects
feature1 = Bio::Feature.new('intron','3627..4059')
feature2 = Bio::Feature.new('exon','4060..4236')
feature3 = Bio::Feature.new('intron','4237..4426')
feature4 = Bio::Feature.new('CDS','join(2538..3626,4060..4236)',
                 [ Bio::Feature::Qualifier.new('gene', 'CYP2D6'),
                   Bio::Feature::Qualifier.new('translation','MGXXTVMHLL...')
                 ])

# And create a container for them
feature_container = Bio::Features.new([ feature1, feature2, feature3, feature4 ])

# Iterate over all features and print
feature_container.each do |feature|
  puts feature.feature + "\t" + feature.position
  feature.each do |qualifier|
    puts "- " + qualifier.qualifier + ": " + qualifier.value
  end
end

# Iterate only over CDS features and extract translated amino acid sequences
features.each("CDS") do |feature|
  hash = feature.to_hash
  name = hash["gene"] || hash["product"] || hash["note"] 
  aaseq  = hash["translation"]
  pos  = feature.position
  if name and seq
    puts ">#{gene} #{feature.position}"
    puts aaseq
  end
end

Attributes

features[RW]

Returns an Array of Feature objects.

Public Class Methods

new(ary = []) click to toggle source

This method should not be used. Only for backward compatibility of existing code.

Since Bio::Features is obsoleted, ::new not returns Bio::Features object, but modifies given ary and returns the ary.

Arguments:

Returns

the given array

# File lib/bio/compat/features.rb, line 98
def self.new(ary = [])
  warn 'Bio::Features is obsoleted. Some methods are added to given array to keep backward compatibility.'
  ary.extend(BackwardCompatibility)
  ary
end
new(ary = []) click to toggle source

Normally, users can not call this method.

Create a new Bio::Features object.

Arguments:

  • (optional) _list of features_: list of Bio::Feature objects

Returns

Bio::Features object

# File lib/bio/compat/features.rb, line 111
def initialize(ary = [])
  @features = ary
end

Public Instance Methods

[](*arg) click to toggle source

Short cut for the #features

# File lib/bio/compat/features.rb, line 140
def [](*arg)
  @features[*arg]
end
append(a) click to toggle source

Appends a Feature object to Features.

Arguments:

Returns

Bio::Features object

# File lib/bio/compat/features.rb, line 123
def append(a)
  @features.push(a) if a.is_a? Feature
  return self
end
each(arg = nil) { |x| ... } click to toggle source

Iterates on each feature object.

Arguments:

  • (optional) key: if specified, only iterates over features with this key

# File lib/bio/compat/features.rb, line 132
def each(arg = nil)
  @features.each do |x|
    next if arg and x.feature != arg
    yield x
  end
end
first() click to toggle source

Short cut for the #features.first

# File lib/bio/compat/features.rb, line 145
def first
  @features.first
end
last() click to toggle source

Short cut for the #features.last

# File lib/bio/compat/features.rb, line 150
def last
  @features.last
end