Visualisation of the birth-death algorithm from treats
Step 5: Re-running Step 1. I.e. selecting lineage B among the living lineages (B, C, D, E).
Lineage selection in modifiers
"selection" part of the modifier: by default, the selection is randomly choosing one lineage among the lineages currently not extinct. In R this is equivalent to:sample(1, n)
or in the treats algorithm:sample(1, lineage$n)