Description Usage Arguments Examples
Estimate distance x using second-order speed function.
| 1 | 
| x0 | location at  | 
| u0 | speed at  | 
| a | second-order speed function parameter, a number | 
| b | second-order speed function parameter, a number | 
| t | forecast time, a number | 
| t0 | initial time  | 
| 1 | xab(0,0,16,0,10,0)
 | 
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