p3

这是一个关于图像识别的程序，可以根据图像中的某些点，识别出图像的形状(This is a program on the image recognition, according to some point in the image, identify the shape of the image)

根据干扰信号波形样式的不同，压制性干扰可分为噪声调幅干扰、噪声调频干扰、噪声调相干扰。就是用噪声或类似噪声的干扰信号遮盖或淹没有用信号，阻止雷达检测目标信息。它的基本原理是：任何一部雷达都有外部噪声和内部噪声，雷达对目标的检测是在这些噪声中进行的，其检测又是基于一定的概率准则的。一般来说，如果目标信号能量S与噪声能量N相比（信噪比S/N），超过检测门限D，则可以保证一定的虚警概率Pfa的条件下达到可检测目标回波所要求的检测概率Pd，简称为可发现目标，否则便称为不可发现目标。(Blanket Jamming can be divided into different styles according to the interference signal waveform, noise AM interference, noise FM jamming noise phase modulation interference. With noise or noise-like interference signal covered or submerged useful signal prevent radar detection target information from. Its basic principle is: any one radar has the external noise and the internal noise of the radar target detection in these noise detection is based on a certain probability criterion. Generally, compared to if the target signal energy S and noise energy N (signal-to-noise ratio S/N), more than the detection threshold D, you can guarantee reach target echo can be detected under the conditions of a certain false alarm probability Pfa requirements detection probability Pd, referred to can be found in the target, otherwise known as not finding the target.)

采用matlab算法绘制齿轮副渐开线及过渡曲线，并生成齿廓坐标点(The matlab algorithm is used to draw the involute and transition curves of the gear pair, and the coordinate points of the tooth profile are generated.)

说明：  Matlab仿真跳频通信的程序 有4个文件(Matlab simulation of frequency hopping communication procedures with 4 files)

PCA(主成分分析法)、LDA(线性判别法)两种方法是主要的的线性降维法，有非常好的效果，希望对大家能够有用！ 已通过测试。 (PCA (Principal Component Analysis), LDA (linear discriminant method) two methods are the main linear dimensionality reduction method, with very good results, we hope to be useful! Has been tested.)

一个关于孤岛效应的仿真，尽量模拟电力系统孤岛效应(A simulation on the island effect, try to simulate the power system islanding)

heat 2D code for finite element, very important

取音频左声道，并画出音频幅值频谱及频率能量图(Take the audio left channel, and draw the the audio amplitude spectrum and frequency energy diagram)

频谱分析说名太短，你这个破网站够可以了，一个分析小程序有啥好说嘛(Spectrum Analysis)

说明：  在弹簧片上放置一个反射镜,反射镜被弹簧振动. 本程序就是模拟这一过程.(In spring place a mirror, mirror vibration by spring. This procedure is to simulate the process.)