Calculate SPR Based Reference Points — calculate_ref

Generalized function for computing and F and biomass based reference point for a given SPR level

Usage

calculate_ref_points(
  nages,
  mort,
  mat,
  waa,
  sel,
  ret,
  avg_rec,
  spr_target,
  start_age = 1,
  hyperallometry = 1
)

nages: number of ages in age structure
mort: instantaneous natural mortality rate
mat: maturity-at-age vector
waa: weight-at-age vector
sel: total selectivity-at-age vector
ret: total retention-at-age vector
avg_rec: average recruitment
spr_target: target SPR level. If length(spr_target) == 1, same target SPR level assumed for the F and B reference points. If length(spr_target) == 2, element 1 corresponds to the spr target for F, while element 2 corresponds to the spr target for B.

list of F reference point and biomass reference point