matlab

Jacobi矩阵一般是坐标变换时用的——这个坐标系的坐标依次对那个坐标系的坐标求偏导数即得Jacobi矩阵。积分时从直角坐标变到球坐标、极坐标肯定要在积分号里乘上Jacobi矩阵的行列式。 若其特征值全为正，则此Jacobi矩阵正定，即它的任何二次型都大于零。并且如果是对称Jacobi矩阵，还可以实相合于一个单位阵。是比较强的条件。矩阵A的特征值是这个关于x的方程的所有根 det(A-xI)=0(Jacobi)

FDTD matlab 程序 时域差分法 有界 (FDTD matlab program bounded difference time domain method)

自己所搭的模型，适应于电力系统方向的进行参考，模型完全可运行且性能良好，希望大家支持。(Take their own models to adapt to make reference to the direction of the power system, the model is fully operational and performance is good, I hope you will support.)

时延估计的WRELAX算法,自己做的，亲测可用(wrelax of time delay estimation)

基于matlab的基本的粒子群程序，可以直接运行，有助于初学者学习(Based on of matlab the basic particle swarm program can be run directly to help beginners learn)

分形维数的计算 ，分形理论逐渐实用，该程序会对大家有帮助的 (Calculation of the fractal dimension, fractal theory gradually utility, the program to be of help)

This is a article about approximate entropy. It will be helpful for motor behavior and rehabilitation study.

考虑载波的qpsk信号在瑞利信道上的仿真(consider Carrier qpsk Rayleigh channel signal simulation)

求解线性不定方程组的一个基解（未知数个数大于方程个数），代码简单有效，可以利用该代码求出所有基解，从而得到不定方程组解得一般形式(A radical solution for solving linear equations uncertain (unknown number greater than the number of equations), the code is simple and effective, you can use the code to all base solution obtained, resulting in variable equations have the general form of the solution)

该代码是用MATLAB代码写出，用于生成格雷码，得到物体的三维信息(The code is written in MATLAB code，Used to generate the Gray code, get the object three-dimensional information)