使用一篇论文提供的方程组和参数——分形仿射变换方法转换过来的MATLAB程序，画一片蕨叶。输入是起始坐标x0,y0和迭代次数——一般在几万次，十万次比较清晰。-Plotting the leaf with equations and parameters given by an essay. This method is　fractal theory. The input is the location of starting points x0,y0 and the iteration times(100,000 times can produce a clear picture.)