Returns a population of individuals alive.

Returns a population of individuals alive.

Usage

# S3 method for population
population_alive(object, t, a1 = 0, a2 = Inf, ...)

Arguments

object

A population data frame containing at least a column birth and death.

t

A numeric indicating the time.

a1

0 by default. All individuals of age over a1 at t are selected.

a2

Inf by default. All individuals of age below a2 at t are selected.

...

Additional params.

Value

The function returns a population data frame containing all individuals alive at time t and of age in [a1,a2).