code: function histogram2D(width, height, init){
          init = typeof init !== 'undefined' ? init : 0;
          this.width = width;
          this.height = height;
          for(var x = 0; x < width; ++x){
              this[x] = [];
              for(var y = 0; y <height; ++y){
                  this[x][y] = init;    
              }
          }
      }
docs: /* 2Dhistogram