get_lambda: Invasion fitness

In rscherrer/speciomx: Adaptive Dynamics Approximation of the Speciome Model

Invasion fitness

Description

Computes the invasion fitness of a mutant in a resident population, given trait values and model parameters.

Usage

get_lambda(x, xres, pars, init, fast = FALSE)

Arguments

x	The mutant trait value
xres	The resident trait value
pars	An unevaluated parameter-list (e.g. as returned by get_default_pars)
init	A vector of two starting values for solving of the demographic equilibrium
fast	See the "Details" section

Details

This function computes an expression for the leading eigenvalue of the transition matrix of the model, which is the invasion fitness of the mutant.

The function will find the demographic equilibrium of the resident (passing init to find_equilibrium) only if fast = FALSE. Otherwise, init is interpreted as a vector of equilibrium population sizes (useful when computing the invasion fitness of many mutants in the same resident population, e.g. in plot_pip).

Value

The invasion fitness of the mutant given the resident

See Also

plot_pip, find_equilibrium

Examples

pars <- get_default_pars()
get_lambda(0.01, 0, pars, init = rep(1000, 2))

rscherrer/speciomx documentation built on March 28, 2023, 8:49 p.m.