powell.control: powell.control
In powell: Powell's UObyQA algorithm

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 `trace` should be set to 0, 1, 2 or 3, which controls the amount of printing. Specifically, there is no output if `trace=0` and there is output only at the return if `trace=1`. Otherwise, each new value of RHO is printed, with the best vector of variables so far and the corresponding value of the objective function. Further, each new value of F with its variables are output if `trace=3`.
`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 `fn` is to be called.
`fnscale`	A scalar to divide the function value by. `fnscale` less than zero implies a maximization rather than a minimization.
`parscale`	A vector to divide the parameter values by. If only one value is given it is replicated to the length of `par`.
`...`	Additional arguments that will be ignored!