sghall

// blog-post - http://www.delimited.io/blog/2013/12/8/chord-diagrams-in-d3
//*******************************************************************
//  CHORD MAPPER 
//*******************************************************************
function chordMpr (data) {
  var mpr = {}, mmap = {}, n = 0,
      matrix = [], filter, accessor;

  mpr.setFilter = function (fun) {
    filter = fun;