photogrammetry

此程序为潮流计算的最后一部分功率计算程序。(This program is the last part of the power flow calculation calculation program.)

分别采用Roe格式和AUSM格式求解一维黎曼问题，并将计算结果与解析解进行比较，发现这两种计算格式都能获得高的计算精度。(Roe scheme were used in this procedure and AUSM format to solve a 1-D RIEMANN problem, and numerical results were compared with the analytical solution, the results can be seen from these two formats have a solution with high accuracy.)

说明：  编程教程，帮助入门学者学习建模，从初级开始，逐步深化，非常有帮助(Programming tutorials, help beginners learn modeling, from the beginning, gradually deepen, very helpful)

matlab求解变系数双曲方程，使用迎风格式(matlab solves the hypolic equation using upwind method)

矩阵的练习 对于掌握数组的 概念很重要。如何快速掌握数组，灵活运用。(The practice of the matrix is ​ ​ very important to grasp the concept of the array. How to quickly grasp the array of flexible use.)

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)

该程序利用最小二乘法进行拟合多元非线性方程。是我做毕设的时候写的。希望对大家有用。(This code can fit multivariable nonlinear equation by using least squares.)

通径分析算法实现，没有gui的小程序，用于数学实验方面的联系，一般计算数学的课程设计(Path analysis algorithm, there is no gui applets, links to mathematical experiments, the general computational mathematics curriculum design)

这是一个有关解二维弹性板的无网格EFG程序matlab源代码,是学习无网格法入门的必学程序!(This is a solution of two-dimensional elastic plate meshless EFG process matlab source code, is a meshless method to study entry procedures must!)

伽辽金有限元解微分方程源代码，带注释，初学者学习使用非常好(Galerkin finit element method )