Class: Array

Inherits:
Object show all
Defined in:
lib/algebra/array-supplement.rb,
lib/algebra/import-module.rb

Overview

Array Supplements

by Shin-ichiro Hara

Version 1.2 (2001.07.23)

Instance Method Summary collapse

Instance Method Details

#each_pair ⇒ Object 



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# File 'lib/algebra/array-supplement.rb', line 8

def each_pair
  each_with_index do |x, i|
    (i + 1).upto(size - 1) do |j|
      y = self[j]
      yield(x, y)
    end
  end
end

#each_pair_with_index ⇒ Object 



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# File 'lib/algebra/array-supplement.rb', line 17

def each_pair_with_index
  each_with_index do |x, i|
    (i + 1).upto(size - 1) do |j|
      y = self[j]
      yield(x, y, i, j)
    end
  end
end

#inner_product(other) ⇒ Object 



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# File 'lib/algebra/array-supplement.rb', line 38

def inner_product(other)
  sum = 0
  each_with_index do |x, i|
    sum += x * other[i]
  end
  sum
end

#rsort ⇒ Object 



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# File 'lib/algebra/array-supplement.rb', line 32

def rsort
  s = sort
  s.reverse!
  s
end

#rsort! ⇒ Object 



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# File 'lib/algebra/array-supplement.rb', line 26

def rsort!
  sort!
  reverse!
  self
end

#sumation ⇒ Object 



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# File 'lib/algebra/array-supplement.rb', line 46

def sumation
  sum = 0
  each do |x|
    sum += x
  end
  sum
end