What if the objective function evaluation fails for certain values of the variables?
We refer to such situation as “virtual” constraint; i.e. constraint whose value cannot be computed at all. All the information that is available about such a constraint is whether it is violated or not. The user has an option to return a “fail=true” flag if the objective function cannot be computed at a given point. The user should not assign artificially high values to the objective function at such points because this can seriously affect the efficiency of the algorithm.
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