| btSb | Evaluate derivative penalty |
| DemoBS | Demonstrate construction of ordinary B-splines |
| DemoKnots | Demonstrate ordinary cubic B-splines on three types of knots |
| DemoNull | Demonstrate null space of a P-spline |
| DemoPBS | Demonstrate construction of periodic B-splines |
| DiffCoef | Compute general differences of B-spline coefficients |
| MakeGrid | Make a grid on the domain |
| NullD | Find null space of a general difference matrix |
| pbsDesign | Build design matrix for periodic B-splines |
| PlaceKnots | Automatically place knots according to data |
| SparseD | Build general difference matrices |
| SparsePD | Build general difference matrices |
| SparseS | Build derivative penalty matrix or its sparse "root" |