nlr.Verbose := Memo1.Lines; // log each step to Memo1.Lines
Memo1.Lines.Clear;
nlr.Recalc;
  // save log to file
  Memo1.Lines.SaveToFile('c:optim.log');

nlr->Verbose = Memo1.Lines; // log each step to Memo1.Lines
Memo1->Lines->Clear();
nlr->Recalc();
  Memo1->Lines->SaveToFile("c:\optim.log");