extrema

里查得森(Richardson)法解偏微分方程的程序。解的是定步长的抛物型偏微分方程： du/dx - a * d2u/dx2 = 0 在程序中可以更改 a 的值以实现不同系数的解。由于它是一种显式格式，解的结果不稳定 在Matlab7下面运行发现竟然有一些值达到十的几十次方,这是算法本身决定的。不是程序有错误(Richard Anderson (Richardson) Solving partial differential equations procedures. Solution is scheduled to step parabolic partial differential equation: du/dx- a* d2u/dx2 = 0 in the procedure can be changed in order to realize the value of a different coefficient of the solution. Because it is an explicit format, the result of instability in the solution of the following Matlab7 running even found some value reached ten dozens of parties, this is the decision algorithm itself. Not a procedural error)

self adapt algorithm using matlab

此代码为维纳滤波恢复模糊图像matlab代码，基于matlab Demo改编，注释较详细，适合初学者学习维纳滤波使用(the code is designed for recovering image by Weiner filter,it is benefitial for new user of matlab or new student for Weiner filter)

Reg in a trahsformer method in matlab

说明：  自己学习的，总结的，不是很好，大部分是书上的，最起码还游泳吧(Their own learning, lessons, not very good, mostly books, at least also swimming)

希尔伯特边际谱的程序，可以学习希尔波特变换的方法(Hilbert marginal spectrum of the process, can learn the Hilbert transform method)

SIFT algorithm for matching the points in images

matlab语言 doolittle 分解解线性方程组(doolittle decomposition solution of linear equations)

录制一段自己的语音信号，并对录制的信号进行采样；画出采样后语音信号的时域波形和频谱图；给定滤波器的性能指标，采用窗函数法和双线性变换设计滤波器，并画出滤波器的频率响应；然后用自己设计的滤波器对采集的信号进行滤波，画出滤波后信号的时域波形和频谱，并对滤波前后的信号进行对比，分析信号的变化；回放语音信号；最后，设计一个信号处理系统界面。(Section of their own voice recording signal, and recording the signal sampling draw sample after the speech signal time-domain waveform and frequency spectrum given filter performance indicators, using a window function method and bilinear transformation design of filters, and draw the frequency response filter then use the filter of their own design for the signal acquisition filtering, after filtering the signal to draw the time-domain waveform and spectrum, and filtering of signals before and after contrast, analysis of signal changes playback voice signal Finally, the design of a signal processing system interface.)

Step function in matlab.....