eigencoder

# Add to config/initializers/enumerable.rb
module Enumerable
  NonUniqueError = Class.new StandardError
  NoElementError = Class.new StandardError
  def take_first!
    unless one?
      if count.zero?
        raise NoElementError.new('Must have exactly one element, but none found.')
      else
        raise NonUniqueError.new('Must have exactly one element, but multiple found.')

eigencoder

import numpy as np


class Point(np.ndarray):
    """
    n-dimensional point used for locations.
    inherits +, -, * (as dot-product)
    > p1 = Point([1, 2])
    > p2 = Point([4, 5])
    > p1 + p2