coala (version 0.1.1)

feat_size_change: Adds an instantaneous change of the population size of one population to a model.

Description

This function changes the effective population size of one population. The change is performed at a given time point and applies to the time interval further on into the past from this point. The population size is set to a fraction of N0, the present day size of population one.

Usage

feat_size_change(new_size, population, time = "0")

Arguments

new_size

A parameter giving the new size of the population, as a factor of N0.

population

The number of the population whose size is changed.

time

The time point at which the size changes.

Value

• A feature which can be added to a model.

Details

If you want to add a slow, continuous change over some time, then use feat_growth.

Examples

# A model with one smaller population
model <- coal_model(c(20,37), 88) +
  feat_size_change(.1, 2, time="1")