The following function drives the iteration of each algorithm. The function performs one iteration to update the state of the minimizer. The same function works for all minimizers so that different methods can be substituted at runtime without modifications to the code.
These functions perform a single iteration of the minimizer s. If the iteration encounters an unexpected problem then an error code will be returned. The error code
GSL_ENOPROGsignifies that the minimizer is unable to improve on its current estimate, either due to numerical difficulty or because a genuine local minimum has been reached.
The minimizer maintains a current best estimate of the minimum at all times. This information can be accessed with the following auxiliary functions,
These functions return the current best estimate of the location of the minimum, the value of the function at that point, its gradient, and minimizer specific characteristic size for the minimizer s.
This function resets the minimizer s to use the current point as a new starting point.