Controls convergence in `powell`

.

1 2 | ```
powell.control(trace = 0, rhobeg = log(100)/10, rhoend = 1e-04,
maxit = 1e+05, fnscale = 1, parscale = 1, ...)
``` |

`trace` |
an integer that determines the level of information
produced at each step of the optimizer. The value of |

`rhobeg` |
About one tenth of the greatest expected change to a variable. |

`rhoend` |
Indicates the accuracy that is required in the final values of the variables. |

`maxit` |
The upper bound on the number of times |

`fnscale` |
A scalar to divide the function value
by. |

`parscale` |
A vector to divide the parameter values by. If only
one value is given it is replicated to the length of |

`...` |
Additional arguments that will be ignored! |

`rhobeg`

and `rhoend`

must be set to the initial and
final values of a trust region radius, so both must be positive with
`rhoend<=rhobeg`

.

Sundar Dorai-Raj

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