getRoot: Get the Root of the Fish Model

In cboettig/bs-tipping: Bifurcation or State Tipping in a Trophic Cascade Experiment

Description

Numerically finds the roots of the fish model given starting values (adults, [sun]fish, and juveniles) and parameter (harvest of adults, qE)

Usage

getRoot(x, pars, maxiter = 1000, ...)

Arguments

x	a vector of length 3 with names A0 (adult bass), F0 (planktivorous fish), and J0 (juvenile bass)
pars	vector of parameters to pass to model
maxiter	maximum number of iterations to use when finding root
...	additional arguments to pass to fishStep

Value

numeric vector with roots

Examples

getRoot(c(A0=15, F0=50, J0=10), pars=c(qE=-0.02)) # stocking, high starting A
getRoot(c(A0=2, F0=50, J0=5), pars=c(qE=-0.02)) # stocking, but start low A
getRoot(c(A0=15, F0=1, J0=15), pars=c(qE=0.02)) # harvesting, start high A

cboettig/bs-tipping documentation built on May 5, 2019, 7:08 a.m.