The new Solver handles both linear and nonlinear problems, of a size at least as great as the old Solver in 1-2-3 Release 5. For details on linear and nonlinear problems, see What kinds of models can the Solver handle?
Unlike the old Solver, the new Solver will produce only one “answer,” which is the optimal solution. You can see and, if you wish, save intermediate “answers” by selecting the new Solver’s Show Iteration Results option. On problems with well-defined feasible or optimal solutions, the new Solver will normally find the same optimal solution as the old Solver, within the limits of numerical accuracy. On problems with multiple, locally optimal solutions, the new and old Solver may report different solutions. In rare cases, one Solver may find a solution where the other one couldn’t find a solution, but this usually indicates a problem with the model.
