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Project stock abundance to the next time step

Source: R/model_int.R
calc_nextN.Rd

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]