Threshold HCR with Fmax scaled by Age Structure — as_scalar_threshold

Compute an allowable fishing mortality rate from a threshold HCR parameterized by f_min, f_max, lrp, and urp, but scales f_max by an age structure summary statistic relative to the value of that summmary statistic for some reference age structure.

Usage

as_scalar_threshold_f(x, naa, ref_naa, as_func, ..., f_min, f_max, lrp, urp)

Arguments

x: input to HCR (e.g. SSB or, SSB/B40)
naa: an age structure (e.g. numbers at age or biomass at age)
ref_naa: am age structure to compare `naa` to
as_func: a function that compute an age structure statistic (must take naa as its first argument)
...: additional arguments to pass to `as_func(naa, ...)`
f_min: F to use when x < lrp
f_max: F to use when x > urp
lrp: value of x below which f_min applies
urp: value of x above which f_max applies