Class: VectorComparer

Inherits:
Object
  • Object
show all
Defined in:
lib/vector_comparer.rb

Class Method Summary collapse

Class Method Details

.compare_vectors ⇒ Object 



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# File 'lib/vector_comparer.rb', line 23

def self.compare_vectors
  puts "How many test vectors should there be?"
  @number_of_test_vectors = gets.chomp.to_i
  puts "What should the threshold be?"
  @threshold = gets.chomp.to_i

  #Generate 10, 128-d random vectors

  random_vectors = Array.new(@number_of_random_vectors)
  @number_of_random_vectors.times do |i|
    random_vector = Array.new(@dimensions)
    @dimensions.times do |n|
      random_vector[n] = random1 
    end
    random_vectors[i] = random_vector
  end

  #Generate x, 128-d test vectors

  test_vectors = Array.new(@number_of_test_vectors)
  @number_of_test_vectors.times do |i|
    test_vector = Array.new(@dimensions)
    @dimensions.times do |n|
      test_vector[n] = random1 
    end
    test_vectors[i] = test_vector
  end    

  puts "For threshold #{@threshold}..."
  test_vectors.each do |test_vector|
    number_near_orthogonal = 0
    random_vectors.each do |random_vector|
      dp = dot_prod(test_vector,random_vector)
      if dp.abs < @threshold 
        number_near_orthogonal += 1
      end
    end
    puts "The random test vector was nearly orthogonal to #{number_near_orthogonal} or the initial vectors"
  end
end

.dot_prod(v1, v2) ⇒ Object 



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# File 'lib/vector_comparer.rb', line 15

def self.dot_prod(v1,v2)
  product = 0
  v1.length.times do |i|
    product += v1[i] * v2[i]
  end
  return product
end

.random1 ⇒ Object 



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# File 'lib/vector_comparer.rb', line 6

def self.random1
  number = rand(2)
  if number == 0 
    return -1
  else
    return 1
  end
end