Class: Clusterer::DocumentsCentroidVector

Inherits:
Object
  • Object
show all
Defined in:
lib/clusterer/lsi/documents_centroid_vector.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(docs = []) ⇒ DocumentsCentroidVector

Returns a new instance of DocumentsCentroidVector.



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# File 'lib/clusterer/lsi/documents_centroid_vector.rb', line 28

def initialize(docs = [])
  @no_of_documents = docs.size
  return if @no_of_documents == 0
  @centroid = docs[0]
  docs.slice(1..docs.length).each {|d| @centroid = @centroid + d}
  @centroid = @centroid / @no_of_documents
end

Instance Attribute Details

#centroid ⇒ Object (readonly)

Returns the value of attribute centroid.



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# File 'lib/clusterer/lsi/documents_centroid_vector.rb', line 26

def centroid
  @centroid
end

#no_of_documents ⇒ Object (readonly)

Returns the value of attribute no_of_documents.



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# File 'lib/clusterer/lsi/documents_centroid_vector.rb', line 25

def no_of_documents
  @no_of_documents
end

Instance Method Details

#merge!(centroid) ⇒ Object 



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# File 'lib/clusterer/lsi/documents_centroid_vector.rb', line 40

def merge!(centroid)
  return unless centroid.centroid
  unless @centroid
    @centroid = centroid.centroid
    @no_of_documents = centroid.no_of_documents
  else
    @centroid = (@centroid * @no_of_documents) + (centroid.centroid * centroid.no_of_documents)
    @centroid = @centroid / (@no_of_documents += centroid.no_of_documents)
  end
end

#to_dmatrix ⇒ Object 



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# File 'lib/clusterer/lsi/documents_centroid_vector.rb', line 36

def to_dmatrix
  @centroid
end