calc_nextN: Project stock abundance to the next time step

In multiSA: Multi-Stock Assessment

Project stock abundance to the next time step

Description

This function applies survival of the current abundance, advances age classes, re-distributes the stock using the movement matrix.

Usage

calc_nextN(
  N,
  surv,
  na = dim(N)[1],
  nr = dim(N)[2],
  ns = dim(N)[3],
  advance_age = TRUE,
  mov = array(1/nr, c(na, nr, nr, ns)),
  plusgroup = TRUE
)

Arguments

N	Abundance at current time step. Array ⁠[a, r, s]⁠
surv	Survival during the current time step. Array ⁠[a, r, s]⁠
na	Integer, number of age classes
nr	Integer, number of regions
ns	Integer, number of stocks
advance_age	Logical, whether the animals advance to their next age class
mov	Movement array in the next time step. Array ⁠[a, r, r, s]⁠. Rows denote region of origin and columns denote region of destination.
plusgroup	Logical, whether the last age class is an accumulator plus group.

Value

Abundance at the next time step. Array ⁠[a, r, s]⁠

multiSA documentation built on March 21, 2026, 1:06 a.m.