title: How to find out Geometric Median
body: <p>The question is: </p>
  
  <blockquote>
    <p>Given N points(in 2D) with x and y coordinates, find a point P (in N
    given points) such that the sum of distances from other(N-1) points to
    P is minimum.</p>
  </blockquote>
  
  <p>This point is commonly known as <a href="http://en.wikipedia.org/wiki/Geometric_median" rel="noreferrer">Geometric Median</a>. Is there any efficient algorithm to solve this problem, other than the naive <code>O(N^2)</code> one?</p>