ex4

图像检索与查询，实现图像的检索与查询，用matlab编程实现，其中含有图片。(image retrieval)

使用matlab编程对于isodata算法的实现(Using matlab programming algorithm for isodata)

This function used for calculate ellipse point to draw.

电力系统潮流算法，极坐标算法和直角坐标算法(Power flow algorithm, polar coordinates algorithm and Cartesian coordinates algorithm)

说明：  矢量控制是目前交流电机的先进控制方式，一般将含有矢量变换的交流电机控制都称 之为矢量控制，实际上只有建立在等效直流机模型上，并按转子磁场准确定向的控制，电机才能获得最优的动态性能。 矢量控制的基本思路是以产生相同的旋转磁动势为准则，将异步电机在静止三相坐标系上的定子交流电流通过坐标变换等效成同步旋转坐标系上的直流电流，分别加以控制，以达到直流电机的控制效果。(Vector control is an advanced control method of AC motor at present. Generally, vector control is called vector control. In fact, only based on the equivalent DC motor model and accurately oriented control according to the rotor magnetic field, can the motor obtain the optimal dynamic performance. The basic idea of vector control is to generate the same rotating magnetomotive force as the criterion. The stator AC current of asynchronous motor in the static three-phase coordinate system is converted into DC current in the synchronous rotating coordinate system by coordinate transformation, and then controlled separately to achieve the control effect of DC motor.)

通过巴特沃斯滤波器的通带和阻带截止频率以及通带和阻带衰减做出相关的图形。(Through the Butterworth filter passband and stopband cut-off frequency and passband and stopband attenuation to make the relevant graphics.)

说明：  采用一种离散微分跟踪器的PID控制。被控对象是三阶传递函数，参考输入rin=20，干扰信号是0.5rands（1）。(PID Controller with Partial differential)

此例程为配套书籍的第六章例题6-5的相对应代码，功能为计算非平稳随机信号的WVD时频谱，编程环境为matlab。(This routine matching books Chapter Example 6-5 corresponding to the code for the calculation of the non-stationary random signal WVD spectrum programming environment for matlab.)

这是MATLAB 主要函数指令表（按功能分类）.(This is the main function of MATLAB command table (according to the functions of classification).)

This program is used for face recognition which uses color histogram method