mnito

def popcount(v):
    lu = (0, 1, 1, 2, 1, 2, 2, 3)
    c = 0
    while v > 0:
        c += lu[v & 0x7]
        v >>= 3
    return c


def hamming(v1, v2):

mnito

require 'json'
require 'sinatra'

def tf_idf(word, doc, docs)
  tf = doc.scan(/#{word}/).length / Float(doc.split.size)
  docs_with_word = docs.map{ |doc| (doc.include? word) ? 1 : 0 }.reduce(0, :+)
  idf = Math.log(docs.length / Float(1 + docs_with_word))
  tf * idf
end

mnito

function xyz_to_srgb (xyz) {
  var xsm = [
    [3.2406255, -1.537208, -0.4986286],
    [-0.9689307, 1.8757561, 0.0415175],
    [0.0557101, -0.2040211, 1.0569959]
  ];

  var rLinear = xyz.x * xsm[0][0] + xyz.y * xsm[0][1] + xyz.z * xsm[0][2];
  var gLinear = xyz.x * xsm[1][0] + xyz.y * xsm[1][1] + xyz.z * xsm[1][2];
  var bLinear = xyz.x * xsm[2][0] + xyz.y * xsm[2][1] + xyz.z * xsm[2][2];