erchengfa3d

四阶龙格库塔法 数值计算 C++源码 可直接运行(Fourth-order Runge-Kutta numerical method C++ source code can be run directly)

求解流场二维无粘欧拉方程，中心差分，人工耗散(Solving the flow field in two-dimensional inviscid Euler equation, central difference, artificial dissipation)

最小二乘法在二维平面测向交叉定位里的应用(The least squares method in the two-dimensional plane measured to cross positioning)

计算一般的mie散射光强等参数的精确程序，得到muller矩阵的各个元素表达式(scattering of Mie)

增广拉格朗日乘子方法求解RPCA问题的方法，得到矩阵的稀疏成分和低秩成分。(argumented lagrange multiplier method that can make matrix be decomposed to a sparse matrix and low-rank matrix.)

实现贝叶斯最大后验概率计算，适合原理的研究，简单易懂。(To achieve the maximum a posteriori Bayesian probability, the principle of appropriate and easily understood.)

说明：  通过模型决定系数完成支持向量机参数优化，并建立基于大数据的支持向量机模型实现回归拟合(The parameters of SVM are optimized by the coefficient determined by the model, and the regression fitting is realized by the support vector machine model based on big data)

牛顿迭代求根法和牛顿-steffensen加速法(Newton method for root-solving problems. Newton-Steffenson is also included.)

计算电磁学基础教材， 包括MOM FEM FDTD(fundmental materail for beginner include MOM FEM FDtd)

水质模型，用于计算河流下游及河口水环境容量(use for water quality)