R script for simulating cap-delta distributions (Budding, set B)

This R script, when executed, generates simulated phylogenies and fossil records under a budding scenario with branching and extinction rates greater than sampling rates, saving the cap-delta values at the root (as defined in the manuscript).本R脚本运行后，可在分支速率与灭绝速率均高于采样速率的出芽演化模式（budding scenario）下，生成模拟系统发育树（phylogenies）与化石记录，并保存本文手稿中定义的根节点处的帽δ值（cap-delta）。