knife_edge: Weight based knife-edge selectivity function

In mizer: Dynamic Multi-Species Size Spectrum Modelling

Weight based knife-edge selectivity function

Description

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.

Usage

knife_edge(w, knife_edge_size, ...)

Arguments

w	Vector of sizes.
knife_edge_size	The weight at which the knife-edge operates.
...	Unused

Details

You would not usually call this function directly. Instead, set the sel_func column in gear_params() to "knife_edge" and provide knife_edge_size as an additional column. setFishing() will then call this function automatically when calculating the selectivity array.

Value

Vector of selectivities at the given sizes.

See Also

gear_params() for setting the knife_edge_size parameter.

Other selectivity functions: double_sigmoid_length(), knife_edge_length(), sigmoid_length(), sigmoid_weight()

Examples

knife_edge(w = c(1, 10, 100, 1000), knife_edge_size = 100)

mizer documentation built on Aug. 31, 2026, 5:08 p.m.