shudu2

利用MATLAB解决<偏微分方程数值算法>中的一些问题,如插值求解(Use MATLAB to solve <partial differential equations numerical algorithm> in a number of issues, such as interpolation to solve)

simple problem(sonar) low pass filter

用matlab7.0实现傅里叶频移特性的验证 带GUI图形化界面窗口(To use matlab7.0 Fourier frequency shift characteristic verify with GUI graphical interface window)

国外多变量反馈控制的最经典教材，全名为《多变量反馈控制_分析与设计》第二版，高清！(Multivariable Feedback Control- Analysis and Design_Second Edition)

ecg 小波分析在心电信号去噪中的应用。小波应用，说明。(ecg ECG signal de-noising Wavelet Analysis Application)

the tranformation from X,Y Z to geodetic latitude and longitude

《数字图像处理》(Matlab版)第八章中JPEG的近似实现，附带了自己的注释(" Digital Image Processing" (Matlab version) Chapter VIII of the approximate realization of JPEG, with my own comments)

设r是f(x) = 0的根，选取x0作为r初始近似值，过点（x0,f(x0)）做曲线y = f(x)的切线L，L的方程为y = f(x0)+f (x0)(x-x0)，求出L与x轴交点的横坐标 x1 = x0-f(x0)/f (x0)，称x1为r的一次近似值。过点（x1,f(x1)）做曲线y = f(x)的切线，并求该切线与x轴交点的横坐标 x2 = x1-f(x1)/f (x1)，称x2为r的二次近似值。重复以上过程，得r的近似值序列，其中x(n+1)=x(n)－f(x(n))/f (x(n))，称为r的n+1次近似值(Let r is f (x) = 0 root, select the initial approximation x0 as the r, over point (x0, f (x0)) to do the curve y = f (x) the tangent L, L the equation y = f ( x0)+ f ' (x0) (x-x0), find the intersection of L and the x-axis of abscissa x1 = x0-f (x0)/f' (x0), x1 is called an approximation r. Through points (x1, f (x1)) to do the curve y = f (x) the tangent, and find the intersection of the tangent with the x-axis of abscissa x2 = x1-f (x1)/f ' (x1), x2 is called r the second approximation. Repeat the process, get an approximation of the sequence r, where x (n+1) = x (n)-f (x (n))/f ' (x (n)), as an approximation of r n+1 times)

从数字电路角度，分析PI(比例和积分）环路滤波电路所组成的闭环控制环路的传输函数以及误差传输函数的形状，从中可以看书环路的peaking，3db带宽以及稳定性等性能(From the perspective of digital circuits, analyze the PI（propotional & integral) loop filter s closed-loop transfer function as well as the error transfer function, from which you can easily see the loop peaking factor, 3db bandwidth, and stability performance of the closed loop)

利用群酉码编码，差分译码的MATLAB仿真程序(Using group unitary coding, differential coding of the MATLAB simulation program)