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The following Matlab project contains the source code and Matlab examples used for a pretty seashell gui. This GUI draws a seashell, using a parametric surface. The parameters of the seashell can be modified with sliders and buttons in the GUI. See also the seashell.m file, also on MATLAB Central (with no GUI). The source code and files included in this project are listed in the project files section, please make sure whether the listed source code meet your needs there

extern的用法，本文较详细的介绍了extern的用法及注意事项。(extern usage, this paper describes in detail the usage of extern and precautions.)

SIFT算子程序，，使用简单，，代码有注释，，并给出使用方法(SIFT operator subroutine, use simple code annotated, and given the use)

turbo code can use in communication application with matlab program

复合材料层合板极限应力计算(matlab) 这是我课后作业(Composite Laminates ultimate stress calculation matlab)

本程序模拟日间24个时段光伏出力情况，根据三点估计法求出光伏出力和三点取值的权重(This procedure simulated photovoltaic output is 24 hours in the day, and the photovoltaic output based on three-point estimate method and the weight of three values)

常规波束形成和基于认知的常规波束形成 及其比较(The conventional beamforming and cognitive-based conventional beam formation and)

用于语音识别的基于高谱分辨率的谱减法,内容详细(For speech recognition based on high-resolution spectral subtraction spectrum)

周期图法进行功率谱估计的函数，配套张旭东的课本习题(Periodogram power spectrum estimate of function, supporting the Textbook Exercise Zhang)

说明：  利用M序列实现系统的结构辨识和参数辨识，有些很好的辨识效果(Use of M sequence to achieve the system' s structure identification and parameter identification, and some very good recognition results)