SimpleMatrix

数值模拟方腔内Rayleigh-Benard对流。采用交错网格投影法，能量方程采用松耦合方法。(Numerical Simulation of square cavity Rayleigh-Benard convection. Using staggered grid projection method, the energy equation using loosely coupled approach.)

用最小二乘法进行电力系统状态估计，包含IEEE30节点的电力系统图(Using least squares power system state estimation, including IEEE30 bus power system diagram)

金属表面反射模型算法，用于计算不同金属的偏振反射参数。(Metal surface reflectance model algorithm used to calculate the different metal polarized reflectance parameters.)

说明：  实现快速离散傅里叶变换，即FFT,很有用的程序(Fast discrete Fourier transform, namely, FFT, very useful program)

一个表达式计算库，支持算术，逻辑运算，位运算，支持多层级的if/then/else，功能强大。(Calculation of an expression library, support for arithmetic, logic operations, bit computing, multi-level support if/then/else, powerful.)

说明：  资源共享两阶段dea模型matlab实现(Two stage DEA model of resource sharing based on MATLAB)

PCA算法程序设计步骤： 1、去均值 2、计算协方差矩阵及其特征值和特征向量 3、计算协方差矩阵的特征值大于阈值的个数 4、降序排列特征值 5、去掉较小的特征值 6、去掉较大的特征值(一般没有这一步） 7、合并选择的特征值 8、选择相应的特征值和特征向量 9、计算白化矩阵 10、提取主分量 (PCA algorithm programming steps: 1 to mean 2, calculation of covariance matrix and its eigenvalues and eigenvectors 3, the calculation of covariance matrix eigenvalues greater than the threshold number of 4, in descending order of eigenvalue 5, remove the smaller eigenvalue 6, remove the larger eigenvalue (usually not this step) 7, the combined choice of eigenvalues 8, select the appropriate eigenvalues and eigenvectors 9, computing whitening matrix 10, principal component extraction)

说明：  粒子滤波算法的时间分析程序，matlab实现(Particle filter time analysis program, matlab achieve)

对于abaqus子程序学习的初学者，这是一个学习umat的很好算例,(Abaqus subroutine for beginners to learn, this is a good example to learn umat,)

计算fft，输出频谱，相位，模值,Calculation of FFT, the output frequency, phase, amplitude,