S参数提取

FFT（Fast Fourier Transformation）是离散傅氏变换（DFT）的快速算法 [1] 。即为快速傅氏变换。它是根据离散傅氏变换的奇、偶、虚、实等特性，对离散傅立叶变换的算法进行改进获得的。(FFT (Fast Fourier Transform) is a fast algorithm of discrete Fourier Transform (DFT). That is fast Fourier transform. According to the odd, even, imaginary and real characteristics of discrete Fourier transform, the algorithm of discrete Fourier transform is improved.)

运筹学基础教材，很难得的运筹学教材，供大家学习之用。

abaqus粘弹性人工边界，手动添加比较简单的模型(learning abaqus)

说明：  最小二乘一次完成算法，C语言编写，源码，调试通过。(A complete least-squares algorithm, C language, source code, debugging through.)

读取raw文件，函数文件输出具体矩阵数值(Read raw files, functions, file output specific matrix values)

程序计算在声速梯度下水中声线的传播并计算声线的长度(Program calculates the velocity gradient in the water line of acoustic sound propagation and calculate the length of the line)

汽车仿真模型，包含七自由度仿真模型、m文件和数学方程式(Car simulation model，Contains seven degrees of freedom simulation model m file and mathematical equations)

用于处理电力系统中含有4个节点的随机潮流计算(Four nodes to deal with the random flow calculation)

功能是将邻接矩阵或关联矩阵变为有向或者无向网络图，有结果显示。(Function is to convert the adjacency matrix or the correlation matrix becomes directed or undirected network diagram, results show.)

在有限元分析中的网格划分好坏直接关系到模型计算的准确性，这里是关于网格划分的一些讨论。(In in the analysis of finite element mesh is directly related to the accuracy of the calculation model, there is some discussion about grid division.)