SI_SIS_SIR_SEIR

基于模糊自动控制的分形滤波算法。通过计算分形维数选定滤波器实现自适应滤波去噪。(Automatic control based on fuzzy fractal filtering algorithm. By calculating the fractal dimension ， select adaptive filter to achieve de-noising .)

利用分步傅里叶方法求解非线性薛定谔方程的matlab程序。(Using split-step Fourier method for solving nonlinear Schrö dinger equation matlab program.)

本程序采用MATLAB语言对电力系统的各种短路计算进行分析计算，如单相接地短路，两相短路，两相接地短路等。(This procedure using MATLAB language for a variety of short-circuit calculation power system analysis and calculation, such as single-phase ground short circuit, two-phase short-circuit, two-phase ground short circuit.)

这是一个音像高低通滤波MATLAB代码，其中包括巴特沃斯低通滤波，高斯高通滤波，高斯低通滤波，理想矩形低通滤波，理想圆形低通滤波……(This is a sound image high and low pass filter MATLAB code, which includes Butterworth low-pass filter, Gaussian high-pass filter, Gaussian low-pass filter, ideal rectangular low-pass filter, ideal circular low-pass filter ...)

说明：  遗传算法是计算数学中用于解决最佳化的搜索算法，是进化算法的一种。进化算法最初是借鉴了进化生物学中的一些现象而发展起来的，这些现象包括遗传、突变、自然选择以及杂交等。遗传算法通常实现方式为一种计算机模拟。对于一个最优化问题，一定数量的候选解（称为个体）的抽象表示（称为染色体）的种群向更好的解进化。传统上，解用二进制表示（即0和1的串），但也可以用其他表示方法。进化从完全随机个体的种群开始，之后一代一代发生。在每一代中，整个种群的适应度被评价，从当前种群中随机地选择多个个体（基于它们的适应度），通过自然选择和突变产生新的生命种群，该种群在算法的下一次迭代中成为当前种群。(Genetic algorithm (GA) is a search algorithm used to solve optimization in computational mathematics. It is one of evolutionary algorithms. Evolutionary algorithms were originally developed by borrowing phenomena in evolutionary biology, such as heredity, mutation, natural selection and hybridization. Genetic algorithms are usually implemented as a computer simulation. For an optimization problem, an abstract representation of a certain number of candidate solutions (called individuals) (called chromosomes) evolves towards a better solution. Traditionally, solutions are represented in binary (that is, strings of zeros and ones), but other representations are possible. Evolution begins with a population of completely random individuals, and it happens from generation to generation.)

这是图论中的一些常用算法的matlab程序。里面不仅有代码，还有相关数学知识(This is the graph theory in some of the commonly used algorithm matlab program. Which not only code, there are related to mathematical knowledge)

function [g, badg] = numgrad(fcn,x,varargin)

使用有限差分法和分裂步傅里叶解法求解抛物方程，并增加散射体和地形的建模仿真。(Using the finite difference method and the split-step Fourier solution for solving the parabolic equation, and increase the scatterer and terrain modeling and simulation.)

本程序是牛顿拉夫逊法求解电力系统潮流计算，包括节点导纳矩阵的计算等(This program is the Newton Raphson method for solving power flow calculation, including the calculation of the node admittance matrix, etc.)

matlab写的语音短时时域处理的代码。 里面有详细的介绍和要求。(matlab written speech short time domain processing code)