递归实现分型树，由一个主干开始生成一棵完整的树-Typing recursion tree, from a trunk to start generating a full tree

用MATLAB实现几种分形曲线的源程序，里面用了递归，程序绝对可用，可调参数。-MATLAB source program snowflakes curve, use inside the recursion, and procedures can be absolutely, adjustable parameter.