message: skip zeros = 1
diff: @@ -353,7 +353,7 @@ int main(int argc, char *argv[])
  b->AddBdrFaceIntegrator(
  new BoundaryFlowIntegrator(inflow, velocity, -1.0, -0.5));
  - int skip_zeros = 0;
  + int skip_zeros = 1;
  m->Assemble();
  k->Assemble(skip_zeros);
  b->Assemble();
  