Functions for adaptors
| Name | Description |
|---|---|
| state1 | Return state (with one derivative) |
| state1der1 | Return 1st derivative (der of state1) |
| state2 | Return state (with two derivatives) |
| state2der1 | Return 1st derivative (der of state2) |
| state2der2 | Return 2nd derivative (der of state2der1) |