function ElementMatrix(top) {
  CommanalityMatrix.call(this, top);

  this.row(' ');
  this.collum(' ');
  this.classlist = top.root.classlist;
}
function ElementMatrix(top) {
  CommanalityMatrix.call(this, top);

  this.row(' ');
  this.collum(' ');
  this.classlist = top.root.classlist;
}
function ElementMatrix ( top ) { CommanalityMatrix . call ( this , top ) ; this . row ( ' ' ) ; this . collum ( ' ' ) ; this . classlist = top . root . classlist ; }
Collects features and bind them to the node density
Collects features and bind them to the node density