code: function _magnitudeOf(values) {
    var result = 0;
  
    for (var i = 0; i < values.length; i++)
        result += values[i] * values[i];
  
    return Math.sqrt(result);
  }
docs: Returns the magnitude of the vector
  
  Given v = (x1, x2, ... xN)
  magnitude is defined as n = x1 * x1 + x2 * x2 + ... + xN * xN
  
  @param {Array} values: values of the vector
  @returns {Number} maginitude