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function Px = per(x,n1,n2) PER Estimate the spectrum of a process using the periodogram ----------- USAGE Px = per(x,n1,n2) The spectrum of a process x is estimated using the periodogram. x : input sequence n1 : starting index, x(n1) n2 : ending index, x(n2) The periodogram is returned in Px using a linear scale. If n1 and n2 are not specified the periodogram of the entire sequence is computed.

本代码是基于k-mean聚类的关键帧提取代码，是用matlab来实现的。(The code is based on k-mean clustering key frame extraction code, using matlab to achieve.)

说明：  压缩感知算法，里面有大量压缩感知训练算法(AMP1235675432134564321)

matlab中的数值微分，有用中点公式，自适应法，理查森外推算法等方法求函数的导数，算法的程序实现在文件中都已经给出了。(in the numerical differentiation matlab, useful midpoint formula, adaptive method, Richardson extrapolation methods such as France seek the derivative of the function, the algorithm of the program implementation in the document have been given.)

该程序模拟了一个39节点的电力系统线性状态估计，并假设每个节点都安装pmu装置。(The program simulates a 39 node linear power system state estimation, and assuming that each node installation pmu device.)

针对DS-CDMA系统的QPSK调制方式的MATLAB仿真。(The simulation of QPSK modulation for DS-CDMA system based on MATLAB .)

采用matlab编程进行有限元温度场显示(Using matlab programming for finite element temperature display)

MATLAB程序设计之常微分方程算法源码MATLAB programming algorithm source of Ordinary Differential Equations(MATLAB programming algorithm for ordinary differential source MATLAB programming algorithm source of Ordinary Differential Equations)

Refractive index matlab code for ec engineer

线性调频雷达的程序计算。对于初学者来说，可以看看。希望有所帮助。(for this function. if needed,you are welcomed to download it.)