coala (version 0.2.0)

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 = 1, 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 whichs size changes. Can also be set to "all". Then the size changes applies to all populations.

time

The time at which the populations size is changed.

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")