message: fix traversal to run with just 1 component (until field2D with higher number of components are added)
diff: @@ -396,7 +396,7 @@ int main(int argc, char** argv)
  //default options
  int ncells = 10000;
  int nmats = 50;
  - int ncomp = 3;
  + int ncomp = 1;
  bool use_sparse = true;
  double fill_percentage = .2;
  