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MAtlab code to do depth conversion of horizons in seismic interpretation

模糊控制pid仿真，包括整体的软件设计等实现方法(fuzzy pid simulation)

Garder 大作，通信领域同步大拿Garder的经典著作！精通锁相环！(Garder masterpiece, the communication field synchronization big take Garder classics! Proficient in phase-locked loop!)

Addition for existing code

用matlab实现了PID 控制的编程，得到了较好的控制效果(Realize a PID control with matlab programming, get a better control effect)

说明：  数据分析(Python language learning data analysis)

关于ofdm的一个程序，OFDM的仿真，可以用flipdim函数构造对称共轭矩阵(A program on ofdm, OFDM simulation, you can use flipdim conjugate symmetric matrix function construction)

Implement primitive realloc(3) functionality.

城市切换功能,点击城市可以弹出其他城市进行切换(the demo is to change city)

一个相当好用的matlab函数，由美国国家可再生能源实验室科研人员设计，可以计算太阳的直射维度和方位角。只要输入时间、观测地点即可。 (This algorithm is based on numerical approximation of the exact equations. The authors of the original paper state that this algorithm should be precise at+/- 0.0003 degrees. I have compared it to NOAA solar table (http://www.srrb.noaa.gov/highlights/sunrise/azel.html) and to USNO solar table (http://aa.usno.navy.mil/data/docs/AltAz.html) and found very good correspondance (up to the precision of those tables), except for large zenith angle, where the refraction by the atmosphere is significant (difference of about 1 degree). Note that in this code the correction for refraction in the atmosphere as been implemented for a temperature of 10C (283 kelvins) and a pressure of 1010 mbar. See the subfunction un_topocentric_zenith_angle_calculation� for a possible modification to explicitely model the effect of temperature and pressure as describe in Reda & Andreas (2003). )