R script for simulating cap-delta distributions (Bifurcation)

This R script, when executed, generates simulated phylogenies and fossil records under a bifurcating cladogenesis scenario with equal branching, extinction and sampling rates, saving the cap-delta values at the root (as defined in the manuscript).本R脚本（R Script）运行后，将在具有均等分支速率、灭绝速率与采样速率的二歧分支支系发生情景下，生成模拟系统发育树（simulated phylogenies）与化石记录（fossil records），并保存本文手稿中所定义的根节点处的cap-delta值（cap-delta）。