Douglas_Peucker

通过最小二乘辨识系统模型，并进行必要的分析，是上系统辨识课的实验内容，有程序和报告(By least squares identification system model and the necessary analysis on System Identification lesson experimental content, procedures and reporting)

说明：  数学建模工具箱 有丰富的数学建模模型，全部用matlab语言编写(Mathematical Modeling Toolbox)

说明：  虽然现在网上的FFT程序很多，但是有的结果是错误的，比如说，经过一次正反变换后，不能得到原来的数列，所以，本人测试了多个程序，提供几个能用的，给大家，希望大家支持！ (Although many online FFT program, but some results are wrong, for example, through a positive and negative change, you can not get the original series, so I tested several programs to provide a few usable for everyone I hope we can support!)

说明：  本程序基于matlab进行了声波在固体中的仿真模拟。(This procedure carried out based on sound waves in matlab in the simulation of solid.)

利用直接法和间接法求双谱，有例子，可直接运行(bispecd and bispeci)

我自己用c语言写的64点基4FFT算法，在visual c++ 6.0环境下编译通过。同matlab结果一致。(My own use C language to write the 64 based 4FFT algorithm, in visual c++ 6 compiler environment through. Results consistent with matlab.)

基于最小二乘的多项式拟合法的GPS周跳探测程序(Based on the least square polynomial fitting method of GPS cycle slip detection program )

根据X和Y两组数据，将两组数据在X-Y平面上最小二乘法拟合出圆(According to X and Y two sets of data, the two sets of data in the X-Y plane, the least square method of fitting the circle)

光滑粒子（SPH）模拟couette流动，代码是根据刘桂荣老师《光滑粒子流体动力学-一种无网格方法》书后的代码改编，较实用，请需要的下载(Smoothed Particle (SPH) simulation couette flow, the code is based on Liu Guirong teacher " smoothed particle hydrodynamics- a non-grid method" Code adaptation of the book, more practical, please download required)

利用支路追加法求阻抗矩阵,解：输入数据如下: 请输入节点数:n=a 请输入支路数:nl=b 请输入由支路参数形成的矩阵: B=[i j z bc t it ......]其中ij为支路端点，z为支路阻抗，bc为对地电容，t为变压器变比，it表示i端点是否与变压器直接相连。 (Seek additional method using branch impedance matrix)