利用多边形无限接近圆的方法计算π值，可以通过增加变数来改变其精确度。-Unlimited use of polygons close to a circle π value calculated can be variable to change by increasing its accuracy.

插值与拟合的matlab实现，毕设内容，高光谱图像基本处理，搭建OFDM通信系统的框架。- Interpolation and fitting matlab implementation, Complete set content, basic hyperspectral image processing, Build a framework OFDM communication system.