I do not believe that to be true, because with numerical modeling, almost anything is differentiable (x'=x[n]-x[n-1] or the like) Additionally, GA is to be avoided because (as I understand it) the answer are not guaranteed to be optimal in any form, which means you never know if there is a better solution, just that this one might be good enough.So it is possible, but w/o more info, I doubt it.