Returns the global optimum and its value.
getGlobalOptimum(fn)[smoof_function]
Objective function.
[list] List containing the following entries:
param [list]Named list of parameter value(s).
value [numeric(1)]Optimal value.
is.minimum [logical(1)]Is the global optimum a minimum or maximum?
Keep in mind, that this method makes sense only for single-objective target function.