Skip to contents

Project stock abundance to the next time step

Source: R/model_int.R
calc_nextN.Rd

This function generates the abundance array by calculating survival from current mortality, then advances age classes, re-distributes the stock, and adds recruitment.

Usage

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

R

Incoming total recruitment. Vector length s. Only assigned if advance_age = TRUE.

mov

Movement array in the next time step. Array [a, r, r, s]. Rows denote region of origin and columns denote region of destination.

recdist

Distribution of incoming recruitment. Matrix [r, s]. Only assigned if advance_age = TRUE.

plusgroup

Logical, whether the last age class is an accumulator plus group.

Value

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