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createimage函数实现当前零水平集（演化曲线）在原图上的显示和嵌入函数u的重新初始(Createimage functions implementing the current zero level set (curve evolution in the display on the original) and inline function u initial again )

beta为3时，振元数为11,21,41时的kaiser加权波束方向图。(Kaiser beamforming beampartarn, when beta is 3 and the array element is 11, 21, and 41.)

说明：  实现polar码的简单编译码，包括编码和译码环节(Simple compilation of polar codes)

说明：  用K2算法解决问题,包含程序和说明,是学习的好材料(K2 algorithm used to solve the problem, including the procedures and instructions, is good material for learning)

Soruce code for Spectral Analysis

利用FFT快速计算，线性排列阵子方向图。( This function computes and returns the gain radiation pattern for a linear array It uses the FFT to computes the pattern *INPUTS********** Nr ==> number of elements dolr ==> element spacing (d) in lambda units divided by lambda theta0 = steering angle in degrees winid ==> use winid negative for no window, winid positive to enter your window of size(Nr) win is input window, NOTE that win must be an Nr X 1 row vector nbits ==> number of bits used in the pahse shifters negative nbits mean no quantization is used *OUTPUTS****************** theta ==> real-space angle patternr ==> array radiation pattern in dBs patterng ==> array directive gain pattern in dBs ***************************************** )

此算法是Siddon提出的逐行求焦点算法，可以很快地计算出系统矩阵，对于初学者而言，有很好的学习作用，可以作为学习Matlab和图像重建的参考。

说明：  地球物理学中的C++编程，pdf版本的，经典书籍~(Geophysics in the C++ programming, pdf version of the classic book ~)

基于MUSIC算法的信号DOA估计，内有详细原理等等(DOA of direction based on MUSIC )

这是matlab中常用的快捷键，可以使你使用matlab更顺手。(This is the common shortcut keys of matlab.It can make you use matlab better.)