multiSA (version 0.1.0)

calc_nextN: 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
)

Value

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

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.