A knife-edge selectivity function where weights greater or equal to
knife_edge_size are fully selected and no fish smaller than this size
are selected.
knife_edge(w, knife_edge_size, ...)Vector of selectivities at the given sizes.
Vector of sizes.
The weight at which the knife-edge operates.
Unused
gear_params() for setting the knife_edge_size parameter.
Other selectivity functions:
double_sigmoid_length(),
sigmoid_length(),
sigmoid_weight()