Weight based sigmoidal selectivity function

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A sigmoidal selectivity function with 50% selectivity at weight sigmoidal_weight and width sigmoidal_sigma.

sigmoid_weight(w, sigmoidal_weight, sigmoidal_sigma = 3)

Arguments

w

The size of the individual.
sigmoidal_weight

The weight at which the knife-edge operates.
sigmoidal_sigma

The width of the selection function