Solving DDEs with Matlab

聚类分析（K-Means)程序实现及展现

Matlab中文讲义，详细讲解了如何使用Matlab进行程序设计。(将中文译成英语 Matlab Chinese handouts, explain in detail how to use Matlab for programming. )

Fundamentals_of_Database_Systems,_6th_Edition 电子版及课后习题答案(Fundamentals_of_Database_Systems,_6th_Edition PDF & solutions)

temperature data logger-The temperature data logger is a device to read temperature and store persistent temperature and corresponding timestamp data into Flash memory. The collection of temperature data can be retrieved, and analyzed after being logged. The temperature data logger is commonly used for monitoring environmental data and shipments of temperature sensitive products such as foods, pharmaceuticals, and some chemicals. In particular, temperature data logger can operate as a stand-alone device and put in a variety of locations including office, laboratory or geographical location such as mountains, deserts,… and in manufacturing line in industry to collect temperature data over a defined period of time. It is also small enough and portable to be integrated with shipping container or directly attached to products which can be degraded due to exposure to temperature extremes to monitor their temperature

中心极限定理的验证，三种独立分布具有同样的均值与方差，大量叠加后分布趋于正态(Central limit theorem verification, three kinds of independent distribution has the same mean and variance, a large number of superimposed normal after the distribution tends)

根据多行三列的实验数据（x,y,signal)作出contourf图。其中x,y为二位空间位置（或其他概念的二维），signal为在该位置的信号。此代码先将数据按位置不同求平均，再将signal按照其对应的x,y分配到二位矩阵内。最后作图。编这个代码的初衷是为了制作大脑hippocampus区域place cell 活动性的contour 图。(it s a code i made for plotting a contour graph of experimental data (x,y,signal). The data should be n*3 arrays which cannot be plot into contour directly. In fact, it can subplot 6*6 graphs or more, but speed might be slow..... especially, when you want more detailed graphs.)

使用灰度共生矩阵提取纹理信息，程序为一个exe的应用方式(Extract texture information using gray level co-occurrence matrix)

选取windows系统自带的ding.wav信号作为分析对象，在Matlab软件平台下，利用函数wavread对音频信号进行采样，记住采样频率和采样点数，听一下原始声音sound(y, fs, bits)。 （2）音频信号的频谱分析，先画出音频信号的时域波形；然后对音频号进行快速傅里叶变换fft(y,N)，N取32768，画出信号的频谱特性，加深对频谱特性的理解。 （3）根据频谱，反演时域特性，画出时域波形。寻找幅值最大的两个频率，此频率除以fft点数在乘以采样频率就是信号的主频，即可合成信号的时域图形，听一下声音。 （4）对原音频信号进行1024点的分段付立业分析meshgrid （5）根据主要频线合成音频，并画出时域图形，试听合成效果。 （6）采用线性插值（linspace）和傅立业反变换(fliplr, ifft)分别合成音频，并画出时域图形，试听效果。 (err)

电力系统变压器空载合闸时励磁涌流的仿真，设置好了合闸时间，对励磁涌流波形和存在的谐波进行分析，能直观体现励磁涌流的特点。(Power system transformer load switching inrush current simulation, set closing time, the inrush current waveform and the presence of harmonic analysis, can directly reflect the characteristics of the inrush current.)

BPSK、QPSK误码率matlab仿真(BPSK, QPSK BER simulation matlab)