Camille Roux camilleroux

## christmas_tree.rb
((1..20).to_a+[6]*4).each{|i|puts ('#'*i*2).center(80)};puts;puts 'Merry Christmas'.center(80)

## bench_polynomial_regression.rb
require 'matrix'
require 'benchmark'

def regress x, y, degree
  x_data = x.map { |xi| (0..degree).map { |pow| (xi**pow).to_f } }

  mx = Matrix[*x_data]
  my = Matrix.column_vector(y)

  ((mx.t * mx).inv * mx.t * my).transpose.to_a[0]
	require 'matrix'
	require 'benchmark'

	def regress x, y, degree
	x_data = x.map { \|xi\| (0..degree).map { \|pow\| (xi**pow).to_f } }

	mx = Matrix[*x_data]
	my = Matrix.column_vector(y)

	((mx.t * mx).inv * mx.t * my).transpose.to_a[0]