| D02KAF | Second-order Sturm–Liouville problem, regular system, finite range, eigenvalue only |
| D02KDF | Second-order Sturm–Liouville problem, regular/singular system, finite/infinite range, eigenvalue only, user-specified break-points |
| D02KEF | Second-order Sturm–Liouville problem, regular/singular system, finite/infinite range, eigenvalue and eigenfunction, user-specified break-points |
| F06BPF | Compute eigenvalue of 2 by 2 real symmetric matrix |