| G2h1a: | Smooth function | (9 routines) |
| G2h1a1: | User provides no derivatives | (4 routines) |
| G2h1a2: | User provides first derivatives | (6 routines) |
| G2h1a3: | User provides first and second derivatives | (2 routines) |
| G2h1b: | General function (no smoothness assumed) | (0 routines) |