Returns the population's pedigree as stored in the id, mother and father slots. NULL is returned if the input population lacks the required.
Examples
# Create a founder population
founderPop = quickHaplo(2,1,2)
# Set simulation parameters
SP = SimParam$new(founderPop)
# Create a population
pop = newPop(founderPop, simParam=SP)
# Get the pedigree
getPed(pop)
#> id mother father
#> 1 1 0 0
#> 2 2 0 0
# Returns NULL when a population lacks a pedigree
getPed(founderPop)
#> NULL