simulation

说明：  一般粒子群算法，可以解决一般的优化问题，有较好的收敛性和计算速度。(General particle swarm algorithm to solve optimization problems in general, better convergence and calculation speed.)

本程序是作者在科研项目中，编写并亲测。该程序用来求解无约束单目标优化问题。对于约束优化问题，可做相应的修改，即可使用。(Genetic Algorithm coded in Matlab. We used the program to solve the unconstrained optimization problems.)

光子筛随机孔分布的例程，用于光子筛成像时使用(Random photon sieve pore distribution routines for use when imaging photon sieve)

模拟声源在两种介质中产生的声波的传播，采用SPML作为吸收边界(we simulate the propagation of acoustic wave in two media. we use SPML as the boundary conditions.)

The plane stress analysis refers to the problems where the thickness of the structure is very small compared to other dimensions of the structure in the XY plane. The plane stress problem is a 2D problem. The stresses in the z direction are considered to be negligible,
 
0, the stress-strain compliance relationship for an isotropic material becomes,

1.题目：数字滤波器的设计与应用 2.设计要求：利用 Matlab 软件,以复合信号分离为例,对 “数字信号处理” 课程中 的谱分析 、数字滤波器设计和信号滤波这三个过程进行了仿真实现,给出了仿真结果。 3.具体步骤： （1）构造原始信号s(t) （2）画出s(t)的频谱 （3）设计ellipse数字滤波器(IIR)，包括低通，带通，带通，并显示幅频特性 （4）用得到的滤波器进行滤波，分离出三路信号，观察时域波形和幅频特性 （5）用三路信号s1,s2,s3尝试重新合成原始信号 4.问题：为什么重新合成的信号和原信号不相等呢？谁能解释一下？谢谢,QQ:664519036( 1. Title: Digital Filter Design and Application 2. Design requirements: use of Matlab software to composite signal separation, for example, on "Digital Signal Processing" course Of the spectral analysis, digital filter design and signal filtering process carried out three Simulation, the simulation results. 3. Concrete steps: (1) construct the original signal s (t) (2) Draw s (t) of the spectrum (3) design ellipse digital filter (IIR), including low pass, band pass, band pass, and shows amplitude-frequency characteristics (4) filtering with a filter obtained by the isolation of three signals, observed time-domain waveform and frequency characteristics (5) with a three-way signal s1, s2, s3 try to re-synthesis of the original signal 4. Question: Why is re-synthesized signal and the original signal is not equal to it? Who can explain? Thank you, QQ: 664519036)

稀疏脉冲反褶积程序，提高地震资料分辨力的有力工具！！(Sparse pulse deconvolution program, is a powerful tool to improve the resolution of seismic data!!!!!)

黄金分割法求极小，返回值fm为函数极小值，tm为极小值点，f为给定函数，t为函数变量，[a,b]为变量t的搜索区间(Golden section method is extremely small, the return value for the function fm minimum, tm for the minimum point, f for a given function, t for the function of variables, [a, b] for variable search interval t)

利用一个彩色图片，利用matlab编程编成一个有可动倒影的图像(The movable reflection )

it is useful for computing the co occurrence calculation for texture image