sirmod: Gradient-function for the SIR model

In epimdr2: Functions and Data for "Epidemics: Models and Data in R (2nd Edition)"

Gradient-function for the SIR model

Description

Gradient-function for the SIR model

Usage

sirmod(t, y, parameters)

Arguments

t	Implicit argument for time
y	A vector with initial values for the states
parameters	A vector with parameter values for the SIR system

Value

A list of gradients

Examples

require(deSolve)
times  = seq(0, 26, by=1/10)
paras  = c(mu = 0, N = 1, beta =  2, gamma = 1/2)
start = c(S=0.999, I=0.001, R = 0)
out=ode(start, times, sirmod, paras)

epimdr2 documentation built on March 31, 2026, 5:06 p.m.