说明：  文档fractal(1)~fractal(5)是本人花费心血编写的分形几何中一些经典图形的详细Matlab画法（包括Koch曲线、Levy 曲线、分形树、Sierpinski三角形，并附有详细的注解），全部程序都经过认真调试，运行良好。
(Document fractal (1) ~ fractal (5) is to spend my efforts to prepare the fractal geometry of some classic graphical Matlab detailed painting (including the Koch curve, Levy curve, fractal tree, Sierpinski triangle, together with detailed comments) All procedures are carefully debugging, running good.)