基于MATLAB的椭圆拟合算法，有主程序，带结果显示图片-MATLAB-based ellipse fitting algorithm, with the main program, with results show that image

展现数学式，提供直观的图像。 非常实用，使用方便。-Show mathematical expressions provide an intuitive image. Very practical, easy to use.

增量式PID控制算法（m文件实现，包括三种信号源以及结果的图像展示）-Incremental PID control algorithm (m file implementation, including three kinds of image signal source and the results show)