nanosplit

class SimpleLinearRegression
  def initialize(xs, ys)
    @xs, @ys = xs, ys
    if @xs.length != @ys.length
      raise "Unbalanced data. xs need to be same length as ys"
    end
  end

  def y_intercept
    mean(@ys) - (slope * mean(@xs))

nanosplit

require 'date'

# Actually doesn't matter WHAT you choose as the epoch, it
# won't change the algorithm. Just don't change it after you
# have cached computed scores. Choose something before your first
# post to avoid annoying negative numbers. Choose something close
# to your first post to keep the numbers smaller. This is, I think,
# reddit's own epoch. 
$our_epoch = Time.local(2005, 12, 8, 7, 46, 43).to_time

nanosplit

# Function to print strftime results
def print_strftime_formats(a,cur_date)
	a.each do |format|
		b = "%#{format}"
		output = cur_date.strftime(b)
		puts "t.strftime('#{b}'), => #{output}"
	end
end

a = ('a'..'z').to_a