Fishery selectivity-at-age — selectivity_at

Build a selectivity-at-age vector from a selectivity specification.

Usage

selectivity_at_age(ages, selectivity, scale_max = TRUE)

Arguments

ages: Numeric vector of ages (e.g., a_min:a_max).
selectivity: A named list specifying selectivity. Required element type. For type="vector", provide s. For type="knife_edge", provide a_c. For type="logistic", provide a50 and delta.
scale_max: Logical. If TRUE, scales selectivity so that max(s_a) = 1 when possible.

Value

Numeric vector of length length(ages) with values in $[0,1]$. When selectivity$type == "fleets", the returned vector is the effective selectivity-at-age.

Details

This is a user-facing wrapper around an internal helper used by spr_input(). It is useful for sensitivity analyses where the user wants to modify the fishery selectivity specification of an existing spr_input() object.

It returns selectivity bounded to $[0,1]$ and can optionally scale so that max(s_a) = 1.