codes

Gatheral SVI模型包含 raw SVI， Surface SVI 和含有跳过程的SVI(This is a document about the SVI model codes of J.Gatheral including raw SVI, Surface SVI and SVI with jump)

In this section we introduce the idea of Galerkin approximations by considering a simple 1-d boundary value problem

NACA 4位数 翼型数据的生成 Matlab程序(NACA 4 digit airfoil)

There is an algorithm that converts RGB Color to YCbCr

石墨烯量子态密度计算，采用紧束缚近似以及薛定谔方程，计算态密度(Graphene quantum state density calculated using the tight-binding approximation and the Schrodinger equation to calculate the density of states)

凸轮的程序，很好，可以随更改，可以随便变化凸轮的结构。(Cam program, well, you can with the changes, you can easily change the structure of the cam.)

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)

使用BP神经网络预测农产品的需求，论文在知网上应该就一篇。(Using neural network to predict the demand of agricultural products)

说明：  应用龙格库塔算法求解动力学微分方程，求解时域数据(Solving dynamic differential equation with Runge Kutta algorithm)

给出变量的上下边界、初值和代价函数，能够搜索代价函数最小值时的变量取值。属于带约束的优化算法，可以用来求算非线性方程组。(STRSCNE is a Matlab code for constrained nonlinear systems of equations F(x)=0 l<=x<=u where F: R^n--> R^n, l and u are vectors of dimension n. Non-existent lower and upper bounds, i.e. entries of l and u equal to minus o plus infinity, are allowed. The algorithm is a globally convergent procedure that combines Newton method and an elliptical trust-region approach. The elliptical trust-region is defined employing a scaling diagonal matrix D and the trust-region subproblem is approximately solved by the dogleg method. Only strictly feasible iterates are generated. Various input/output options are provided, and we refer to the code itself for further documentation. )