update_params: Update Model Parameters for Stochastic Network Models

In EpiModel: Mathematical Modeling of Infectious Disease Dynamics

Update Model Parameters for Stochastic Network Models

Description

Updates epidemic model parameters originally set with param.net() and adds new parameters.

Usage

update_params(param, new.param.list)

Arguments

param	Object of class param.net, output from function of same name.
new.param.list	Named list of new parameters to add to original parameters.

Details

This function can update any original parameters specified with param.net() and add new parameters. This function would be used if the inputs to param.net() were a long list of fixed model parameters that needed supplemental replacements or additions for particular model runs (e.g., changing an intervention efficacy parameter but leaving all other parameters fixed).

The new.param.list object should be a named list object containing named parameters matching those already in x (in which case those original parameter values will be replaced) or not matching (in which case new parameters will be added to param).

update_params modifies a param.net object before it is passed to netsim(); it is the recommended helper for tweaking parameters outside of a running simulation. To modify parameters from inside a module function during a simulation, use set_param() on the live dat object instead. There is no analogous update_controls() or update_inits() helper: for a control.net or init.net object, edit the list directly (e.g., ctrl$nsteps <- 1000) or rebuild it with a fresh call to the constructor. For scheduled mid-simulation changes to parameters or control settings, see the .param.updater.list argument to param.net() and the .control.updater.list argument to control.net().

Value

An updated list object of class param.net, which can be passed to the EpiModel function netsim().

See Also

set_param() for editing parameters inside a module function during a simulation; param.net() for the parameter constructor; netsim() for running a simulation.

Examples

x <- param.net(inf.prob = 0.5, act.rate = 2)
y <- list(inf.prob = 0.75, dx.rate = 0.2)
z <- update_params(x, y)
print(z)

EpiModel documentation built on May 13, 2026, 9:08 a.m.