Function DEoptim in package DEoptim for differential evolution defines an optional parameter fnMap:

fnMap

"an optional function that will be run after each population is created, but before the population is passed to the objective function. This allows the user to impose integer/cardinality constriants."

Unfortunately, there is no further documentation decribing the kind of parameters being passed to this function on invocation or the structure of the return value expected. I would very much appreciate it if somebody familiar with this package could provide an example illustrating how this interface is meant to be used to enforce cardinality constraints.

Thanks,
David


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